GT chainlines

[Eddie King]

I'm building up a couple of bikes for friends and am now needing to know the chainlines for the frames so I can choose the right b/b

The frames are a GT Pantera AL (u-brake) believe it to be '93.....and a '94 GT RTS Team....any help greatly appreciated

 

[legrandefromage]

My 93 Zaskar was 73mm shell and 127mm axle - you can use shorter axles like a 122mm but you have to be aware that the chain stays are quite thick and heel/ pedal arm clearance is an issue.

Later 94 frames, I think are 68mm shell and 122mm or less for compact 94bcd chainsets

My '97 Zaskar and '97 Avalanche were/ are 68mm shell

 

[mikee]

118 with a dx chainset on my 92 pantera al

its more dependant on the chainset than the frame

 

[jimihendrix]

its more dependant on the chainset than the frame

True, i'm using a 113 axle on a 94 Zaskar with L&M cranks, this was also fine with the previous White Industries cranks i was running.

 

[Eddie King]

.......its more dependant on the chainset than the frame

Thanks....I realise this.....I maybe should have phrased my original question differently i.e......is the chainline on these frames 47.5 or 50 ?.... so that I can choose the correct b/b for my chainsets

 

[MikeD]

47.5mm if it's a 68mm shell, 50mm if it's a 73mm shell.

 

[Eddie King]

47.5mm if it's a 68mm shell, 50mm if it's a 73mm shell.

Ta-Dah !!! ....thankyou thankyou thankyou ....I will now get that as a tattoo

 

[AR-CoolC]

Chainline is a new phrase to me.

Are you talking about the distance the chain is from the centre line of the frame?

 

[SeeingisBelievingGTMuseum]

If building period correct everything Shimano had low profile arms starting in 1993. 1992 for XTR. 122.5 and 127.5 axles were for the M730 and earlier cranks.