Hi
I'm completely new to bike building but am having a go with some old
and new bits and alot of reading up ...
So far, I have two wheels self-built. The rear is Mavic Open Pro, 32x3
DT Competition, Shimano Ultegra hub, SRAM PC950 cassette. I've got a
PC990 chain. I'm going to go with Ergopower levers and the rest of the
components might be Campagnolo unless anyone suggests otherwise (this
is mainly so I don't have to worry about compatibility but, from what
I've read, as long as the rear derailleur and the indexed gear
manafacturers are the same then everything else can be mixed and
matched for 9 speed).
The frame to be used is a Reynolds 653 frame from 1989, used to be a 7
speed Ultegra. Anyway, measured the rear drop-out spacing as 128mm. I'm
not sure if I should be worried about chainline. Clearly, the current
spacing is 2mm too narrow for the hub. My current thought is I should
just go and get a crank and compatible bottom bracket and hope it's OK
and, if not, get the local bike shop to realign the rear hanger and
cold set the frame. Is there any better approach? Is there any way I
can find out the best bottom bracket spindle length? From
http://www.parktool.com/repair_help/clg2.shtml, I calculated my rear
cog middle and I get 41.25mm (assuming 130mm drop out once stretched a
bit). Zinn's book says the chainline should be around 42mm if possible
(I can't really work out why this is so). Both Campagnolo and Shimano 9
speed front double cranks are 43.5mm and Park say "Manufacturers
typically specify a front crankset chain of slightly longer than the
rear chainline.". So I think I'm OK with either manufacturer. Apart
from I want 167.5 mm crank arms :-)
One more little thing: I measure my seat post's circumference as 88.5mm
so that's 28.2mm diameter. I need a band on double front derailleur -
the smallest campagnolo or shimano make is 28.6mm! Sounds silly but is
that going to be OK?
Cheers
ccc rider