BG101's frame plot screen capture needs to be scaled 362.434783% to be life-size
bending formula
Date: Fri, 31 Mar 2000 18:40:19 +0200
From: "tubus_nl, import en framebouw (marten gerritsen)"
Subject: Re: [Frame] fork rake
Dave Jenson wrote:
>
> This is Dave from Jenson Machine works.I am in the process of building a
> fork rakeing fixture and would like to know what math formula to use to
> calculate the length of the fork blade prior to bending to the desired
> radius.
Make a drawing (sideview), figure out which part of the centerline has a
radius,
and [Degrees bend]/360 x 2 x Pi x Radius will give you an first
approximation of
the straight lenght of the curved bit. Real lenght is probably slightly less as
the neutral bending line doesn't quite follow the centerline, but with short
bends this can usually be ignored.
--
Marten Gerritsen
WWW: HTTP://tubus.nl
From: "tubus_nl, import en framebouw (marten gerritsen)"
Subject: Re: [Frame] fork rake
Dave Jenson wrote:
>
> This is Dave from Jenson Machine works.I am in the process of building a
> fork rakeing fixture and would like to know what math formula to use to
> calculate the length of the fork blade prior to bending to the desired
> radius.
Make a drawing (sideview), figure out which part of the centerline has a
radius,
and [Degrees bend]/360 x 2 x Pi x Radius will give you an first
approximation of
the straight lenght of the curved bit. Real lenght is probably slightly less as
the neutral bending line doesn't quite follow the centerline, but with short
bends this can usually be ignored.
--
Marten Gerritsen
WWW: HTTP://tubus.nl
enco order
505-6470 In Stock $1.73 ea $1.73
Line 1. 4-1/2" SINGLE POINT MACHINIST'S SCRIBER
380-0030 In Stock $1.78 ea $1.78
Line 2. 4"TRIANGULAR GENERAL MACHINIST SCRAPER
380-1527 In Stock $1.99 ea $1.99
Line 3. HEAVY DUTY HANDLE FOR HEAVY DUTY DEBURRING TOOL
380-1525 In Stock $.59 ea $2.95
Line 4. E100 DEBURRING BLADE HEAVY DUTY DUBURRING BLADE
382-0036 In Stock $6.13 ea $6.13
Line 5. 10PCRFLR DIE SNKRFILE RIFFLER DIE SINKER FILE SET
382-0061 In Stock $3.09 ea $3.09
Line 6. 10PC. 6" NO. 2 FILESET NEEDLE FILE SET
990-1232 In Stock $5.21 ea $5.21
Line 7. NO.0 CUT 5-1/2" NEEDLE FILE SET OF 12 PIECES
990-3407 In Stock $10.20 ea $10.20
Line 8. 8" BASTARD NICHOLSON HALF ROUND FILE
990-3408 In Stock $12.71 ea $12.71
Line 9. 10" BASTARD NICHOLSON HALF ROUND FILE
990-0024 In Stock $6.19 ea $6.19
Line 10. 0-180DEG/6"DEPTH RULE DEPTH GAUGE W/PROTRACTOR
825-8310 In Stock $4.78 ea $4.78
Line 11. 4OZ.BLUE BRUSH TOP CAN LAYOUT FLUID
DW386-3162 In Stock $5.55 ea $5.55
Line 12. 80 GRIT 1 INCH ALUMINUM OXIDE CLOTH ROLL
240-1256 In Stock $11.26 ea $11.26
Line 13. ADJ7-1/2X2-1/2W/12BLDE EXCEL HANDSAWS
Line 1. 4-1/2" SINGLE POINT MACHINIST'S SCRIBER
380-0030 In Stock $1.78 ea $1.78
Line 2. 4"TRIANGULAR GENERAL MACHINIST SCRAPER
380-1527 In Stock $1.99 ea $1.99
Line 3. HEAVY DUTY HANDLE FOR HEAVY DUTY DEBURRING TOOL
380-1525 In Stock $.59 ea $2.95
Line 4. E100 DEBURRING BLADE HEAVY DUTY DUBURRING BLADE
382-0036 In Stock $6.13 ea $6.13
Line 5. 10PCRFLR DIE SNKRFILE RIFFLER DIE SINKER FILE SET
382-0061 In Stock $3.09 ea $3.09
Line 6. 10PC. 6" NO. 2 FILESET NEEDLE FILE SET
990-1232 In Stock $5.21 ea $5.21
Line 7. NO.0 CUT 5-1/2" NEEDLE FILE SET OF 12 PIECES
990-3407 In Stock $10.20 ea $10.20
Line 8. 8" BASTARD NICHOLSON HALF ROUND FILE
990-3408 In Stock $12.71 ea $12.71
Line 9. 10" BASTARD NICHOLSON HALF ROUND FILE
990-0024 In Stock $6.19 ea $6.19
Line 10. 0-180DEG/6"DEPTH RULE DEPTH GAUGE W/PROTRACTOR
825-8310 In Stock $4.78 ea $4.78
Line 11. 4OZ.BLUE BRUSH TOP CAN LAYOUT FLUID
DW386-3162 In Stock $5.55 ea $5.55
Line 12. 80 GRIT 1 INCH ALUMINUM OXIDE CLOTH ROLL
240-1256 In Stock $11.26 ea $11.26
Line 13. ADJ7-1/2X2-1/2W/12BLDE EXCEL HANDSAWS
hand to metal
it's been a few days. i've been busy.
construction of the jigs has begun. i received full-size plots from my uncle this week. the plots i made by printing the BG101 Frame Plot chart to PDF, then opening the PDF in Illustrator and playing with it there. they're at least pretty close to accurate; probably within a mm.
cut 2x4s and plywood for Talbot's fork jig. bought 5/16" threaded rod, washers, wing nuts. now i'm missing the drill press i was using in classes. and i need a way to cut a hole for the fork crown--Talbot used the hole to braze in; i'm planning to pin and free braze, but i think i'll still need the hole to keep the crown from mucking with alignment.
cut 4 x 12" plywood for bending mandrel. bought EMT tubing for bending assistance, 3/8" pipe nipple and 1/4-20 threaded rod, nuts to hold the blade down while bending. this is all based on a drawing from H. James--email me if you want a scan. i made pdf scans of Talbot's plans for jigs as well.
i need sand to fill the blades with to prevent kinks. also i might switch to the S. Garro method of making two identical plywood pieces, then bevel sanding both so they'll form a valley when they're mated. he explains it better on frameforum.
also working on pine tubing blocks. bought 1" and 1.125" spade bits for boring. planning to enlarge holes with big files.
putting together an Enco order--files, rifflers, scriber, etc.
also working on cleaning up the various frame parts. discovering i need more and different files--smaller ones for the tight spaces. 80 grit emery is OK for larger curved sections, but i'll need needle files and rifflers for sure. i glued some emery to an old emery board, but haven't tried it yet.
sanded the main tubes with 400 grit to remove rust. coated with WD-40 to prevent it. gotta get something to remove it later--acetone?
i had wanted double-bent chainstays. Bringheli was out, so i got single-bent. putting the BB shell and stays together it looked like i'd end up with way too little tire clearance, so i'm returning them for straights i think. USPS screwed up so i have a day to think about it.
and i'm reconsidering the smaller front wheel idea.
construction of the jigs has begun. i received full-size plots from my uncle this week. the plots i made by printing the BG101 Frame Plot chart to PDF, then opening the PDF in Illustrator and playing with it there. they're at least pretty close to accurate; probably within a mm.
cut 2x4s and plywood for Talbot's fork jig. bought 5/16" threaded rod, washers, wing nuts. now i'm missing the drill press i was using in classes. and i need a way to cut a hole for the fork crown--Talbot used the hole to braze in; i'm planning to pin and free braze, but i think i'll still need the hole to keep the crown from mucking with alignment.
cut 4 x 12" plywood for bending mandrel. bought EMT tubing for bending assistance, 3/8" pipe nipple and 1/4-20 threaded rod, nuts to hold the blade down while bending. this is all based on a drawing from H. James--email me if you want a scan. i made pdf scans of Talbot's plans for jigs as well.
i need sand to fill the blades with to prevent kinks. also i might switch to the S. Garro method of making two identical plywood pieces, then bevel sanding both so they'll form a valley when they're mated. he explains it better on frameforum.
also working on pine tubing blocks. bought 1" and 1.125" spade bits for boring. planning to enlarge holes with big files.
putting together an Enco order--files, rifflers, scriber, etc.
also working on cleaning up the various frame parts. discovering i need more and different files--smaller ones for the tight spaces. 80 grit emery is OK for larger curved sections, but i'll need needle files and rifflers for sure. i glued some emery to an old emery board, but haven't tried it yet.
sanded the main tubes with 400 grit to remove rust. coated with WD-40 to prevent it. gotta get something to remove it later--acetone?
i had wanted double-bent chainstays. Bringheli was out, so i got single-bent. putting the BB shell and stays together it looked like i'd end up with way too little tire clearance, so i'm returning them for straights i think. USPS screwed up so i have a day to think about it.
and i'm reconsidering the smaller front wheel idea.
local machinists
Apex Precision Machining 45000 Underwood Lane Sterling VA (703) 904-8123
J B Precision Machining, Inc. 201 Davis Drive Sterling VA (703) 406-4580
RBM Machine 44964 Underwood Lane Sterling VA (703) 435-3276
Micron Precision Grinding 4616 Kenwood Drive Woodbridge VA (703) 730-2961
ADK Machine, Inc. 10126 Residency Road Manassas VA (703) 257-0726
BJL Machine Shop 11824 Dumfries Road Manassas VA (703) 791-4603
H Brauning Company 9093 Euclid Avenue Manassas VA (703) 361-6677
Manassas Crankshaft Service 9061 Liberia Avenue Manassas VA (703) 369-3766
Vapco 9218 Prince William Street Manassas VA (703) 368-9811
P & M Quality Machining Co. 263 Sunset Park Dr., Herndon VA 20170
(703) 471-1731F: (703) 471-5570'
NVA Machine Works 5715 Leesburg Pike Falls Church VA (703) 931-8274
Therma-Strip, Inc. 6712 Jefferson Avenue Falls Church VA 703 536-6292
AVM, Inc. 2820 Dorr Avenue Fairfax VA (703) 698-0332
Aaroflex, Inc. 8550 Lee Highway, Suite 650 Fairfax VA 703 573-0690
Kenson Automotive, Inc. 3801 Pickett Road Fairfax VA (703) 323-0040
Stuart-Dean Company Of Virginia, Inc. 2700 S Nelson Street Arlington
VA (703) 578-1885
Advance Design & Manufacturing, Inc. 6460 General Green Way # A
Alexandria VA (703) 256-9550
Associated Design & Manufacturing Company 814 N Henry Street
Alexandria VA (703) 549-5999
Capital Refinishers, Inc. 3917 Wheeler Avenue Alexandria VA (703) 212-7400
Hartman Technical Service 3919 Wheeler Avenue Alexandria VA (703) 370-5366
Jensen Manufacturing Company 2644 Duke Street Alexandria VA (703) 751-2015
Metal Magic 6647 S Kings Highway Alexandria VA (703) 660-9180
Modern Machine & Parts, Inc. 228 N Henry Street Alexandria VA (703) 683-1232
universalcycles.com prices
$32 technomic 6,7,8,9,10,12 cm 25.4 / 6,7,8,9,10,11,12,13 cm 26.0
$50 Sugino XD300 165, 170, 175
$15 Tektro 221A levers
$14 Shimano HG-53 9-speed chain
$27 Nitto Randonneur bars 45 cm
$28/bike Tektro Oryx 1-pc pads
$62/bike Shimano R550
$44/bike Dia-Compe 750
$20 MKS platforms
$6 black leather toe straps
$13 Shimano Deore front hub M510 black/silver 32/36
$24 Shimano Deore rear hub M510 black/silver 32/36
$28 Sun CR-18 36
$33 Mavic MA-3 silver 32/36
$20 Kalloy Lapadre silver 27.2 x 350
$58 Brooks B-17 Standard black
$14 28.6 front derailer braze-on->clamp adapter
$50 Sugino XD300 165, 170, 175
$15 Tektro 221A levers
$14 Shimano HG-53 9-speed chain
$27 Nitto Randonneur bars 45 cm
$28/bike Tektro Oryx 1-pc pads
$62/bike Shimano R550
$44/bike Dia-Compe 750
$20 MKS platforms
$6 black leather toe straps
$13 Shimano Deore front hub M510 black/silver 32/36
$24 Shimano Deore rear hub M510 black/silver 32/36
$28 Sun CR-18 36
$33 Mavic MA-3 silver 32/36
$20 Kalloy Lapadre silver 27.2 x 350
$58 Brooks B-17 Standard black
$14 28.6 front derailer braze-on->clamp adapter
decals
working on sizing...these are specs of decals sold on ebay
KONA STICKER SET
* 2X KONA DOWNTUBE STICKERS 300X30mm
* 2X KONA FORK STICKERS 180X20mm
* 2x HEADTUBE STICKERS 76X67mm
*
2x SEATUBE STICKERS 55X55mm
You are viewing a Pair of classic Raliegh factory bicycle frame decals, These stand out decals have a super strong adhesive, and give a strong superior look, on any raliegh. The lettering measures as follows; 1 3/16 high x 10" long. a must for restoring.Blooming purple filled white outer stencil.
TREK
THE SIZE OF THE TWO LARGER DECALS IS APPROX = 10" X 1.5" EACH
ANOTHER TWO DECALS SIZE APPROX = 7" X 1"
ALSO ONE LOGO DECAL SIZE APPROX = 2" X 2.75"
|
\ /
V
specs for mine:
DT (31.7 mm diameter) x 2 @
KONA STICKER SET
* 2X KONA DOWNTUBE STICKERS 300X30mm
* 2X KONA FORK STICKERS 180X20mm
* 2x HEADTUBE STICKERS 76X67mm
*
2x SEATUBE STICKERS 55X55mm
You are viewing a Pair of classic Raliegh factory bicycle frame decals, These stand out decals have a super strong adhesive, and give a strong superior look, on any raliegh. The lettering measures as follows; 1 3/16 high x 10" long. a must for restoring.Blooming purple filled white outer stencil.
TREK
THE SIZE OF THE TWO LARGER DECALS IS APPROX = 10" X 1.5" EACH
ANOTHER TWO DECALS SIZE APPROX = 7" X 1"
ALSO ONE LOGO DECAL SIZE APPROX = 2" X 2.75"
|
\ /
V
specs for mine:
DT (31.7 mm diameter) x 2 @
classes i'd love to take
from http://nvcc.edu , the website of my local community college:
AUT 120 Introduction to Automotive Machine Shop
http://www.nvcc.edu/depts/academic/coursecont/summaries/aut120.htm
WEL 116 Welding I (Oxyacetylene)
http://www.nvcc.edu/depts/academic/coursecont/summaries/wel116.htm
EGR 115 Engineering Graphics
http://www.nvcc.edu/depts/academic/coursecont/summaries/egr115.htm
BUS 116 Entrepreneurship
http://www.nvcc.edu/depts/academic/coursecont/summaries/BUS116_.htm
AUT 120 Introduction to Automotive Machine Shop
http://www.nvcc.edu/depts/academic/coursecont/summaries/aut120.htm
WEL 116 Welding I (Oxyacetylene)
http://www.nvcc.edu/depts/academic/coursecont/summaries/wel116.htm
EGR 115 Engineering Graphics
http://www.nvcc.edu/depts/academic/coursecont/summaries/egr115.htm
BUS 116 Entrepreneurship
http://www.nvcc.edu/depts/academic/coursecont/summaries/BUS116_.htm
James Morikawa
http://modikoso.com/nav/documents/coverpage.htm
File this dude under awesome.
Great little site, just a bunch of photos and text on his bikes and framebuilding tools. Wonderfully simple, casual prose. Badass homemade tools. I get the sense this guy would love Zen and the Art of Motorcycle Maintenance.
My favorites, and the reasons this link was mentioned on FrameForum.net, are the measuring tools made from telescoping radio antennae. He's also got a simple, cheap design for an angle measurer.
File this dude under awesome.
Great little site, just a bunch of photos and text on his bikes and framebuilding tools. Wonderfully simple, casual prose. Badass homemade tools. I get the sense this guy would love Zen and the Art of Motorcycle Maintenance.
My favorites, and the reasons this link was mentioned on FrameForum.net, are the measuring tools made from telescoping radio antennae. He's also got a simple, cheap design for an angle measurer.
design drawing
Above is a drawing screen captured from Martin Manning's BG 101 5.1 Excel program, with text added in Illustrator. Actually, I made some slight modifications to the text after measuring my frame parts (most of which arrived from Ceeway late last week), which aren't reflected in the drawing. The main difference is that the head tube is a bit longer, as the estimated crown height was a little too long. Also the dropouts I have are rather long horizontals, while the ones Martin measured must have been shorter.
My main concerns at this point are regarding steering. I'm worried that wheel flop may be a problem because of the combination of short 80 mm stem, 52 mm fork rake, and shallow 71.5° HT angle.
I'm working on a decal set, to be produced by CyclArt.
responding to anonymous
[read the comment to the post before/below this one to understand what i'm talking about]
dammit i wish people would leave their names... i can't think of a reason why one wouldn't, and it would seem to be in the spirit that this whole blog was created to invite open discussion.
first, to clarify the stem thing. what i meant by "mid-length" stem was one in the middle of the range of lengths available. for the nitto technomic, that range in mm is 50-60-70-80-90-100-110-120 as i recall. thus an 80 (or 90) leaves the most room for error on either side.
sounds like i gotta check out this pneumatic trail thing.
dammit i wish people would leave their names... i can't think of a reason why one wouldn't, and it would seem to be in the spirit that this whole blog was created to invite open discussion.
first, to clarify the stem thing. what i meant by "mid-length" stem was one in the middle of the range of lengths available. for the nitto technomic, that range in mm is 50-60-70-80-90-100-110-120 as i recall. thus an 80 (or 90) leaves the most room for error on either side.
sounds like i gotta check out this pneumatic trail thing.
a design, finally
this is damn close to what i'll be aiming for...with the understanding that all this is theoretical, the finished bike may be off a bit, but better to design precisely and build imprecisely than to design imprecisely and build imprecisely. and yea i'll be trying to make it precise.
the area that needs work now is the front end/steering geometry...i don't have the headset in hand yet, so i need to find out its exact lower stack height before locking anything down and building a jig.
the top tube is a compromise between fit and toe clearance. this is one area where i found an enormous amount of conflicting info. Paterek claims front center determines toe overlap--that 58cm is the magic number over which it's not a problem. R. Sachs says not to worry about it--that fit is infinitely more important. a recent discussion on the framebuilders list went on for a week.
i tried to strike a balance between the two Rivendell models i'm copying, the Atlantis and Ramboulliet, and my TT length is about mid-way between the TT lengths of their 58cm sizes. ditto for the chainstays, which are shorter than i had originally planned, but should make the bike a little more maneuverable.
i'm going with a 71.5° HT, a half degree shallower than planned, to allow for a short TT and decent toe clearance. this stretches things out on the front end a bit, so the chainstays got shorter to make up for it in handling. hopefully the wheel flop will be OK. i kept trail 58-59 cm with a 30 mm tire by increasing fork rake 2 mm. the front end is by coincidence very close to the cannondale touring model, which i'm planning to test-ride before building.
i'll attach a drawing soon; it's stuck on my home computer with no WWW access.
in cm unless noted
this was all done in BG 5.1 by Martin Manning, so the info below will be most applicable to users of that program.
me:
inseam 85.0
sternal notch 148.0
torso 63.0
arm length (avg) 65.75
femur (thigh) length (avg) 52.2
foot length (avg) 26.35
calculated:
saddle height, BBc-saddle top 73.64
design specs:
virtual ST 58.7
virtual TT 57.0
HT angle 71.5°
ST angle 72°
CS length 44.4
BB drop 7.75
fork rake 5.2
@ 700x30 tire
wheelbase 104.15
front center 60.93
BBc height 26.35
trail 59.3 mm
standover, mid-TT 82.18
TT angle to horizontal 2.5°
TT c-c 56.26
DT c-c 63.12
HT length c-c 16.23
fork:
front brake reach 64.0 mm (designed for cantis, long calipers or centerpulls possible)
HT upper free length 20 mm
HT lower free length 6 mm
fork length on steerer axis 38.75
tubing:
seat tube Deda ZeroUno 28.6 mm
down tube Deda ZeroUno 31.7 mm
top tube Deda ZeroUno 28.6 mm
head tube Deda ZeroUno 31.7 mm
steering column TT Verus 25.4 x 240 mm
chainstays Deda ZeroTre 29.9 x 16 mm single bend
seat stays Deda ZeroUno 16 mm
fork blades TT Verus 27.6 x 20 x 400, 1.1-0.6 mm
frame parts:
seat lug Long Shen 74° long pt
top head lug Long Shen 74° long pt
bottom head lug Long Shen 60° long pt
BB shell Long Shen 60.3° x 62.3° x 7.3° x 30x1
fork crown R. Sachs/Long Shen Newvex
top eyes/seatstay caps Silva 16 mm
rear dropouts Tecnociclo 70° 2-eyelet
front dropouts Long Shen stainless 2-eyelet plug-in
canti bridge
canti pivots
chainhanger Columbine Quikchainger
brake and chainstay bridges 1/2" 4130 CrMo
bottle bosses stainless, dead-ended
rear rack mounts
lowrider bosses
equipment:
cranks 175 mm 26-36-48t
cassette 9-speed 11-32t
rear hub spacing 135 mm, 2.5mm narrower if possible
steerer 25.4 mm threaded
stem 80 mm Nitto Technomic 26 mm
bars 45 cm Nitto Randonneur 25.4 mm
nitto shim 26.0->25.4 mm
i assumed a lower headset stack of 14 mm and an upper stack of 19 mm based on info in Paterek and specs on the Harris Cyclery site. this is until i can get a measurement of the actual headset to be used, likely a Ritchey Logic.
I decided to design for a mid-length stem, so in the event that I'm off on the TT length, I'll have a few cm leeway available in both directions.
the area that needs work now is the front end/steering geometry...i don't have the headset in hand yet, so i need to find out its exact lower stack height before locking anything down and building a jig.
the top tube is a compromise between fit and toe clearance. this is one area where i found an enormous amount of conflicting info. Paterek claims front center determines toe overlap--that 58cm is the magic number over which it's not a problem. R. Sachs says not to worry about it--that fit is infinitely more important. a recent discussion on the framebuilders list went on for a week.
i tried to strike a balance between the two Rivendell models i'm copying, the Atlantis and Ramboulliet, and my TT length is about mid-way between the TT lengths of their 58cm sizes. ditto for the chainstays, which are shorter than i had originally planned, but should make the bike a little more maneuverable.
i'm going with a 71.5° HT, a half degree shallower than planned, to allow for a short TT and decent toe clearance. this stretches things out on the front end a bit, so the chainstays got shorter to make up for it in handling. hopefully the wheel flop will be OK. i kept trail 58-59 cm with a 30 mm tire by increasing fork rake 2 mm. the front end is by coincidence very close to the cannondale touring model, which i'm planning to test-ride before building.
i'll attach a drawing soon; it's stuck on my home computer with no WWW access.
in cm unless noted
this was all done in BG 5.1 by Martin Manning, so the info below will be most applicable to users of that program.
me:
inseam 85.0
sternal notch 148.0
torso 63.0
arm length (avg) 65.75
femur (thigh) length (avg) 52.2
foot length (avg) 26.35
calculated:
saddle height, BBc-saddle top 73.64
design specs:
virtual ST 58.7
virtual TT 57.0
HT angle 71.5°
ST angle 72°
CS length 44.4
BB drop 7.75
fork rake 5.2
@ 700x30 tire
wheelbase 104.15
front center 60.93
BBc height 26.35
trail 59.3 mm
standover, mid-TT 82.18
TT angle to horizontal 2.5°
TT c-c 56.26
DT c-c 63.12
HT length c-c 16.23
fork:
front brake reach 64.0 mm (designed for cantis, long calipers or centerpulls possible)
HT upper free length 20 mm
HT lower free length 6 mm
fork length on steerer axis 38.75
tubing:
seat tube Deda ZeroUno 28.6 mm
down tube Deda ZeroUno 31.7 mm
top tube Deda ZeroUno 28.6 mm
head tube Deda ZeroUno 31.7 mm
steering column TT Verus 25.4 x 240 mm
chainstays Deda ZeroTre 29.9 x 16 mm single bend
seat stays Deda ZeroUno 16 mm
fork blades TT Verus 27.6 x 20 x 400, 1.1-0.6 mm
frame parts:
seat lug Long Shen 74° long pt
top head lug Long Shen 74° long pt
bottom head lug Long Shen 60° long pt
BB shell Long Shen 60.3° x 62.3° x 7.3° x 30x1
fork crown R. Sachs/Long Shen Newvex
top eyes/seatstay caps Silva 16 mm
rear dropouts Tecnociclo 70° 2-eyelet
front dropouts Long Shen stainless 2-eyelet plug-in
canti bridge
canti pivots
chainhanger Columbine Quikchainger
brake and chainstay bridges 1/2" 4130 CrMo
bottle bosses stainless, dead-ended
rear rack mounts
lowrider bosses
equipment:
cranks 175 mm 26-36-48t
cassette 9-speed 11-32t
rear hub spacing 135 mm, 2.5mm narrower if possible
steerer 25.4 mm threaded
stem 80 mm Nitto Technomic 26 mm
bars 45 cm Nitto Randonneur 25.4 mm
nitto shim 26.0->25.4 mm
i assumed a lower headset stack of 14 mm and an upper stack of 19 mm based on info in Paterek and specs on the Harris Cyclery site. this is until i can get a measurement of the actual headset to be used, likely a Ritchey Logic.
I decided to design for a mid-length stem, so in the event that I'm off on the TT length, I'll have a few cm leeway available in both directions.
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