What price to pay for a good chromoly GT frame like Avalanche, Bravado or Karakoram?

[minor_LEGEND]

Cranks tend to have a optimum b/b width & is specc'd by Shimano. From memory old MT60 (DX) & XT M730 are 127mm for example. Black LX 560 is 110mm as modern cranks took on a lower profile. Throw in 68mm/73mm shell widths & differing frame design & things are not set in stone, but it is a starting point for most applications. The correct question should be which axle length do I need for 'X' crankset?

 

[Black_puma]

Cranks tend to have a optimum b/b width & is specc'd by Shimano. From memory old MT60 (DX) & XT M730 are 127mm for example. Black LX 560 is 110mm as modern cranks took on a lower profile. Throw in 68mm/73mm shell widths & differing frame design & things are not set in stone, but it is a starting point for most applications. The correct question should be which axle length do I need for 'X' crankset?

Thanks for your input.
127mm length seems excessively long, I have a 120mm long BB for the Bravado and even that seems long, But I'll have a play around with a couple of bottom brackets once I get a chain and cassette fitted. According to the Sheldon Brown website it recommends a 122mm length spindle/axle for the MT60.

 

[Lucidone]

GT had saddles with rivets fitted on their high end bikes back then, though the one fitted to my bike is not original GT branded as they're near enough impossible to find!
https://www.retrobike.co.uk/archive/1992-gt-catalogue.610/download see page 6

Just in case.....

https://www.ebay.co.uk/itm/176617481498
Not mine.

 

[Black_puma]

Just in case.....

https://www.ebay.co.uk/itm/176617481498
Not mine.

Cool find, shame it's in such poor condition.

 

[Black_puma]

Hello all,
It's been a while since the last update, but here it is, made some progress on this build.
I fitted a new bottom bracket, a Tange Seiki 68x118, found a size suitable after playing around with different sizes.
Finally got to fit the cables too, set up the gears and brakes. I have not been out on the bike yet as it was getting dark. I may test ride in the morning.
I am still waiting for some brake pads and a cassette, the cassette that is currently fitted came off a 1991 Trek so I can't guarantee it will work with the new chain fitted. I have just put it on to set up the gears for now.