Chainline bottom bracket - London Fixed-gear and Single-speed

chrisis0025 · 5th July 2008

Hello, i wonder if anyone can advise on parts....

I have made a single speed from an old Triumph (raleigh) 1980's racer.
My chainline is 50mm, i need to make it 42mm.
my BB is 68/117 (using a ruler)
therefore i need to lose 9mm (or near as)on one side, so i reckon a 68/107 and a couple of shims on the rear will get me there.

problm is, its the original BB cup and cone type, ann the BB's on the web (like wiggle.co.uk seem to be for modern cassettes, but some look like they might be cup and cone but "housed" (do i make any sense at all?)

or can i just get a replacement shorter axle for my current BB and shove that in?

cheers

pj (pj) · 5th July 2008

just whack a modern cartridge BB in there.

107 should be fine, if it's a SS, you probably won't even need a spacer.

5th July 2008	#1
chrisis0025	Chainline bottom bracket Hello, i wonder if anyone can advise on parts.... I have made a single speed from an old Triumph (raleigh) 1980's racer. My chainline is 50mm, i need to make it 42mm. my BB is 68/117 (using a ruler) therefore i need to lose 9mm (or near as)on one side, so i reckon a 68/107 and a couple of shims on the rear will get me there. problm is, its the original BB cup and cone type, ann the BB's on the web (like wiggle.co.uk seem to be for modern cassettes, but some look like they might be cup and cone but "housed" (do i make any sense at all?) or can i just get a replacement shorter axle for my current BB and shove that in? cheers
	quote reply

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5th July 2008	#2
pj (pj)	just whack a modern cartridge BB in there. 107 should be fine, if it's a SS, you probably won't even need a spacer.
	quote reply

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