Truvativ crankset issue
clanton
Posts: 1,289
I am replacing the Truvativ bottom bracket on my sister's Avalanche. When I came to take the drive side crank off the crank bolt was insanley tight. I got it loose eventually and then found the crank itself on the drive side was very loose, I actually wound the crank extractor by hand to pull it off! Visually it does not look damaged but should this happen? Has it just worked loose or is it knackered?
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Is it a square taper or splined crank? Its probably fine - possibly was locktited in - whack it back on, torque it up and see how you get on.0
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Thanks for that, will try. It is a 12 splined "Power Spline" bottom bracket.0
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That is typical for Truvativ. Your crank arm is damaged and will require replacing. Its a VERY common problem. I would recommend replacing the hole crank and BB with a shimano unit. Where I work (will stay unnamed) Truvativ is more known as TrueShitness for a very good reason.0
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How do you know without looking at it? My powerspline was the same, undamaged and stayed on after removed.0
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You are correct. I should have said that if it was tightened all the way up to the stop and was able to be pulled off by hand then its fucked. But the shear number of them that I see just made me assume it was done up tight. He also said it was done up "insanley tight". That’s just about always because it has come loose and some one has swung on it to do it up. Or when it was fitted it was over tightened. Both ways if it was loose when he undid the bolt its going to be damaged. If it was not tight I would have said refit it and be positive its butted up. Then see if it is loose or stayed tight. This is as its often to get them not fitted correctly.
Clanton, try tightening it up and then taking the bolt off again. if the crank still comes off relatively easily it is defiantly damaged. If its still on tight ish tighten it up again and go for a good hard ride. At the end take the bold off and if its falling off again then again its damaged. If it is damaged you really should replace it.0 -
I got to admit, they aint the best!0
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Thanks very much for the advice! If it was my bike I would be upgrading the whole lot but for now will try to see if we can keep it going on the Truvativ stuff through winter at least.
Last question - the Power Spline I've removed (with great difficulty too) is a 68mm shell, 118mm spindle type. So far I've only been able to locate 108 and 113mm spindle Power splines on line. Will the 113mm spindle be ok?0 -
CRC sell 118mm Truvativ Power-Spline BB's for £10.99 (see http://www.chainreactioncycles.com/Models.aspx?ModelID=21496)0
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Thanks! Hadn't gotten around to checking them yet.0
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By the way, when my Truvativ PowerSpline BB started to creak and click every 180º I took the old one out only to find as you did that one side was finger-tight and the other stiff. I noted the size, and replaced it after a thorough wipe-over with liberal grease addition (you can't get the grease into the bearings as they're sealed) and ordered a new one.
That was in the summer, and the regreased (and tightened) BB is still going strong with no further noise or roughness!
It may be worth refitting the original to see whether the bulk of the problem was purely down to the looseness of the cup.0
