MTB bottom bracket question; crank or BB?

[crashley]

I'm doing a cheap refurb of an old Dawes Edge XT i had as a kid that's been sat at the back of the garage.

The old LX crank is knackered so i bought a new Acera FCM361 tapered crankset to replace it. The new crankset however now fouls the frame at the lowest sprocket - now, do i need a need (wider) bottom bracket or are there old 'spacers' or similar i need to get the new crank to fit?

Apols daft question, i just want to be clear before i end up buying a new BB remover tool or other old pointless bits i don't actually need.

Cheers,
Ash

[zasker]

Don’t think there is an option for extenders. Think normal standard was 68mm and 73mm for the bottom bracket itself, you could measure the frame to get this and then various options for different axle lengths. I assume you don’t have the old BB to measure?

[crashley]

zasker said:

Don’t think there is an option for extenders. Think normal standard was 68mm and 73mm for the bottom bracket itself, you could measure the frame to get this and then various options for different axle lengths. I assume you don’t have the old BB to measure?

I do, the old BB is there and it looks like a 70/110m but the crank is different in that the new crank is more recessed as it sits on the spindle, whereas the old LX crank has a flange that takes it proud of the smallest chain-ring.

My guess is to just replace the BB with a wider one.

[Zippee]

crashley said:

zasker said:

Don’t think there is an option for extenders. Think normal standard was 68mm and 73mm for the bottom bracket itself, you could measure the frame to get this and then various options for different axle lengths. I assume you don’t have the old BB to measure?

I do, the old BB is there and it looks like a 70/110m but the crank is different in that the new crank is more recessed as it sits on the spindle, whereas the old LX crank has a flange that takes it proud of the smallest chain-ring.

My guess is to just replace the BB with a wider one.

Sounds like you need a wider axle not shell, how much does the inner foul by and is the crank done up tight when it does? Id try a 118 spindle and see how you get on.

[Justin S]

Quick google says this :

Details
- Entry level 7-/8-speed chainset offering slick hyperdrive shifting performance for off road enthusiasts
- 7-/8-speed compatible steel chainrings
- For use with square taper bottom brackets 122.5mm

[crashley]

Justin S said:

Quick google says this :

Details
- Entry level 7-/8-speed chainset offering slick hyperdrive shifting performance for off road enthusiasts
- 7-/8-speed compatible steel chainrings
- For use with square taper bottom brackets 122.5mm

I've just discovered the same, thank you very much. New BB and removal tool ordered.