Creaking square taper bottom brackets + cranks

[peanut]

If you can't do it yourself (and I doubt it 'cos I've had the exact same problem) you might find that Highpath Engineering can reface the cranks for you.

370" lbs sounds like about 30ft lbs which seems a bit light to me. I was told 40ft lbs which I've done - seems frighteningly tight - but no further problems.

Truvativ recommend a maximum torque of 31. ft lbs f if you use any more you run the risk of the crank arm splitting from the hole out as the axle taper forces the aluminium hole outwards

 

[peanut]

Shimano and Truvativ both use JIS (rather than ISO) square tapers so the combo should be ok (surely?).

this is beginning to sound to me like a mismatch of axle and crank taper. either that or the crank is going onto the axle taper too far and is hitting the axle lip preventing a good fit . if that is the case check, there should be a slight gap between the face of the crank and the beginning of the round part of axle taper.

 

[barq]

this is beginning to sound to me like a mismatch of axle and crank taper. either that or the crank is going onto the axle taper too far and is hitting the axle lip preventing a good fit . if that is the case check, there should be a slight gap between the face of the crank and the beginning of the round part of axle taper.

Yeah, I'm inclined to agree. Even when I first fitted the cranks they went a long way onto the axle by hand before I installed the bolt. Bottom line is they don't fit and all the torque in the world isn't going to fix it because it just jams the cranks against the round bit of the taper.

I've used TruVative/Shimano combinations before with no problem, but I'll email the retailer and TruVative to see what they say.

In the meantime I've taken advantage of the 10% off deal on CRC to get Shimano replacements. Thanks everyone.

 

[peanut]

good choice. I always try to salvage something if I can cos I hate waste but so often it is better to get a nice new one and then you get rid of all the agravation and time wasting at a stroke
I'll take my own advice one day.

 

[barq]

good choice. I always try to salvage something if I can cos I hate waste but so often it is better to get a nice new one and then you get rid of all the agravation and time wasting at a stroke
I'll take my own advice one day.

I'm going to try and get them replaced. As far as I can see they should fit and I installed them correctly. Failing that they'll go in the parts box, I expect the chainrings might be useful if nothing else.

 

[peanut]

I'm going to try and get them replaced. As far as I can see they should fit and I installed them correctly. Failing that they'll go in the parts box, I expect the chainrings might be useful if nothing else.

good luck. My advice is to insist on speaking to the manager. Be polite but firm ,don't lose your cool and threaten him but make it clear you'll not settle for nothing. You could suggest he gives you a replacement for half price if he won't give you a replacement.

 

[barq]

good luck. My advice is to insist on speaking to the manager. Be polite but firm ,don't lose your cool and threaten him but make it clear you'll not settle for nothing. You could suggest he gives you a replacement for half price if he won't give you a replacement.

*Nods*

Absolutely. I'm quite prepared to compromise... split the difference, accept a credit note... I used to be a customer service manager for a big retailer and I ran an internet shop for two years - so I understand both sides. So often people go wrong by jumping in with both feet kicking rather than sensibly explaining the problem and what they'd like done.

Thanks for your help peanut (and others).