Chainline help needed...
05-23-05 | 01:05 PM
#1
Thread Starter
Ken Pickles is dead.
Joined: Apr 2005
Posts: 107
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From: No. Yar. ME
Chainline help needed...
Ok, here goes. I'm having Carl Strong build me a ss road bike. I have a set of blue Phil Wood Kiss-off hubs in 135mm spacing that I am going to run on the bike (with white velocity deep v rims, drool). I'll have the rear triangle spaced to 135, so my question is this:
I have a line on a C-Record road crank (the most beautiful crank ever made in my opinion), but I want to understand if my chainline will work with the 135 rear spacing. Can I get a Campy triple BB w/ 111mm spacing to work with the crank? How does one figure thie chainline out without trial and error, without buying lot of expensive BB's, and before I have my frame made?
help...
I have a line on a C-Record road crank (the most beautiful crank ever made in my opinion), but I want to understand if my chainline will work with the 135 rear spacing. Can I get a Campy triple BB w/ 111mm spacing to work with the crank? How does one figure thie chainline out without trial and error, without buying lot of expensive BB's, and before I have my frame made?
help...
05-23-05 | 01:21 PM
#2
shoot up or shut up.
Joined: Nov 2003
Posts: 1,961
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From: colorado springs, co
Bikes: yes please.
have you looked at this page? https://www.sheldonbrown.com/chainline/
05-23-05 | 01:29 PM
#3
Thread Starter
Ken Pickles is dead.
Joined: Apr 2005
Posts: 107
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From: No. Yar. ME
ok, I read that article, and it's saying that my rear hub chainline from center to shoulder is 45.35mm, great, I get that, and my freewheel (white Ind. ENO) is 8.73 from shoulder to chainline. So do I add 45.35 + 8.73 or do I subtract 8.73 from 45.35??? And then how do I know what my chainline on the crank/bb combo will be without it installed on the frame?
Last edited by indigosky; 05-23-05 at 01:41 PM.
05-23-05 | 02:07 PM
#4
Thread Starter
Ken Pickles is dead.
Joined: Apr 2005
Posts: 107
Likes: 0
From: No. Yar. ME
ok, I re-read it and it says to add the two numbers together, but that results in a chainline of 54.08, which ~seems~ wider than any bb/crank combination listed on sheldon brown.
I (still) don't get it! Am I dense?
I (still) don't get it! Am I dense?
05-23-05 | 02:10 PM
#5
dead mileage
Joined: Aug 2004
Posts: 480
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From: London U.K.
Bikes: GT Mtnbike, PaulMilnes Trackbike
First you would need to know what size BB the C record cranks call for as a double.
Your chainline in the rear would be 54.08
And most road doubles use a 46mm chainline on the outer ring, you would need a BB 8mm longer than the original road BB.
Which might be hard to find for campy taper.
Your chainline in the rear would be 54.08
And most road doubles use a 46mm chainline on the outer ring, you would need a BB 8mm longer than the original road BB.
Which might be hard to find for campy taper.
05-23-05 | 02:33 PM
#7
Wher'd u Get That Jacket?
Joined: Sep 2004
Posts: 1,317
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From: Somewhere in the Tubes
Bikes: Calfee Dragonfly, Lemond Poprad, Airborne Manhatten Project, Calfee Luna Fixie
You can find one...Phil makes lots of really wide square taper bbs that fit campy.
But I don't know for sure how to help without trial and error. The place to start would be normally be to figure your front chainline. Why don't you just pm sheldon brown he's reg'd on this board, or give him a call and ask him. Tell us what he says.
But I don't know for sure how to help without trial and error. The place to start would be normally be to figure your front chainline. Why don't you just pm sheldon brown he's reg'd on this board, or give him a call and ask him. Tell us what he says.
05-23-05 | 04:50 PM
#8
Drunken Harmonica Band
Joined: Mar 2005
Posts: 118
Likes: 0
From: Philly / CT
Bikes: Windsor, Schwinn Le Tour, Schwinn Varsity
the mathmatical equation is:
[Over locknut dimension - (cog to inside fork x 2)] / 2 = chainline for rear
Use order of operations. If you don't know order of operations, you shouldn't be trying to figure things like this out. Get your GED. knowledge is power!
Def start with the front. Unless your chainline is wicked off, it'll give you a good reference point to let you know if your math is somewhat correct.
[Over locknut dimension - (cog to inside fork x 2)] / 2 = chainline for rear
Use order of operations. If you don't know order of operations, you shouldn't be trying to figure things like this out. Get your GED. knowledge is power!
Def start with the front. Unless your chainline is wicked off, it'll give you a good reference point to let you know if your math is somewhat correct.
05-23-05 | 05:02 PM
#9
Originally Posted by votedean
the mathmatical equation is:
[Over locknut dimension - (cog to inside fork x 2)] / 2 = chainline for rear
Use order of operations. If you don't know order of operations, you shouldn't be trying to figure things like this out. Get your GED. knowledge is power!
Def start with the front. Unless your chainline is wicked off, it'll give you a good reference point to let you know if your math is somewhat correct.
[Over locknut dimension - (cog to inside fork x 2)] / 2 = chainline for rear
Use order of operations. If you don't know order of operations, you shouldn't be trying to figure things like this out. Get your GED. knowledge is power!
Def start with the front. Unless your chainline is wicked off, it'll give you a good reference point to let you know if your math is somewhat correct.
Actually that would be from the inside of the dropout to the centerline of the cog.
And wouldn't the chainline be closer to 52mm (45.35 hub + 7.05 DA cog)? Thats about what I got with my fixed Cross-Check. In reality, theres a bit of variation from the advertized values.
And I don't even have a GED.
__________________
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
05-23-05 | 05:05 PM
#10
Senior Member
Joined: Sep 2003
Posts: 391
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From: Seattle, WA
Bikes: Surly Steamroller, Rodriguez (custom SS)
Originally Posted by votedean
the mathmatical equation is:
[Over locknut dimension - (cog to inside fork x 2)] / 2 = chainline for rear
Use order of operations. If you don't know order of operations, you shouldn't be trying to figure things like this out. Get your GED. knowledge is power!
Def start with the front. Unless your chainline is wicked off, it'll give you a good reference point to let you know if your math is somewhat correct.
[Over locknut dimension - (cog to inside fork x 2)] / 2 = chainline for rear
Use order of operations. If you don't know order of operations, you shouldn't be trying to figure things like this out. Get your GED. knowledge is power!
Def start with the front. Unless your chainline is wicked off, it'll give you a good reference point to let you know if your math is somewhat correct.
Jim
05-23-05 | 05:23 PM
#11
Originally Posted by jimv
Can't this be simplified to: (O.L.D. /2) - [cog to inside of fork]
__________________
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
05-23-05 | 06:10 PM
#12
Drunken Harmonica Band
Joined: Mar 2005
Posts: 118
Likes: 0
From: Philly / CT
Bikes: Windsor, Schwinn Le Tour, Schwinn Varsity
Originally Posted by jimv
Can't this be simplified to: (O.L.D. /2) - [cog to inside of fork] ??
Originally Posted by dobber
That requires schooling in Differential Equations and the application of Laplace Transforms.
