To measure the chain line get the distance from the centre of the seat tube to the top of the chain ring, something like 45mm. The rear ends are 126mm, so half equals 63mm. The difference (63 - 45) will be about 18mm, which should be the distance from the centre of the rear cog to the inside of the fork end. Just do your own measurements. It was easier in the 1950's when the standard chain line was 1.5 inches.
Help a layman - 120 hub to 126 frame
- Thread starter unicanitor
- Start date
unicanitor
Devout Dirtbag
I see, measurements i've taken - from the very tip of the tooth on the chainring to the centre of the bottom bracket shell measures 43mm and from the tip of the tooth on the rear cog to the inside of the fork end measures 21mm. Does that sound workable?
If you placed the wheel with 3mm space each side then the chain line would be 1mm out.
When you get the axle you could adjust the spacing, but if it's 1mm out I would not expect a problem. On an old track bike with 1inch x 3/8 block chain then I would get it right, but modern chains are flexible. This assumes the frame is straight.
When you get the axle you could adjust the spacing, but if it's 1mm out I would not expect a problem. On an old track bike with 1inch x 3/8 block chain then I would get it right, but modern chains are flexible. This assumes the frame is straight.
unicanitor
Devout Dirtbag
Thanks for the information, to summarise it seems worth taking the plunge and buying tha axle and having a go. My next and hopefully final question before i overstay my welcome, can anyone point me in the direction of somewhere i can purchase the axle and spacers and did we conclude on a length i should specify?
unicanitor
Devout Dirtbag
I should add, i've just tried the front wheel...
No it's fine
No it's fine
Nice ones for £20:
http://www.sjscycles.co.uk/wheels-manuf ... prod17111/
Maybe 2nd hand ones from Wayne Blenkin on lfgss?
Cheap ones on ebay (search solid axle), but might not be the same thread as Campag., so would need to check.
Nick
http://www.sjscycles.co.uk/wheels-manuf ... prod17111/
Maybe 2nd hand ones from Wayne Blenkin on lfgss?
Cheap ones on ebay (search solid axle), but might not be the same thread as Campag., so would need to check.
Nick
unicanitor
Devout Dirtbag
Thanks once again.
I msg'd the guy on the LFGSS forum so i'll see what he comes back with availability wise if not i'll take the plunge on the one in the link above.
I msg'd the guy on the LFGSS forum so i'll see what he comes back with availability wise if not i'll take the plunge on the one in the link above.
Or if you want the real deal, Nigel at campyoldy lists them:
"Solid 10mm rear axle 170mm long, useful for Pista hub in 126mm road ends, this a Camp stamped part possibly #1281 £23.00"
Just looked at Wayne's most recent listing (http://www.lfgss.com/thread80968.html) and he doesn't list one specifically, but he does list spacers.
If you just want to give it a go to test chainline, let me know and you can borrow mine to give it a try before forking out £20+.
Nick
"Solid 10mm rear axle 170mm long, useful for Pista hub in 126mm road ends, this a Camp stamped part possibly #1281 £23.00"
Just looked at Wayne's most recent listing (http://www.lfgss.com/thread80968.html) and he doesn't list one specifically, but he does list spacers.
If you just want to give it a go to test chainline, let me know and you can borrow mine to give it a try before forking out £20+.
Nick
