Crank Falling Off

[roadiewill]

Ok so my crank had been creaking for about two weeks.. and me being lazy didnt really bother to take it all apart but instead, opted for a quick clean. Wjilst out yesterday the whole left crank came off.. luckily I was sable to get to the LBS and they put a new bolt on but warned that it may not last too long. I looked at the inside of the crank and good see that the metal had been deformed under pressure, but nothing too severe. So today whilst out with my mates, the same thing happened.. so I whipped out the 8mm key and gave it a damn good tightening, and amazing it held on for about 30 miles. However, I could still here creaking/ ticking, especially on steep climbs. My question is, do you think should just upgrade it now to a sealed crank like the lbs recomended, or leave it and it might be ok? Anyone know how much it would be to upgrade roughly, obv. it depends on the crank.. but any ideas??

cheers

 

[Gerry Attrick]

Ok so my crank had been creaking for about two weeks.. and me being lazy didnt really bother to take it all apart but instead, opted for a quick clean. Wjilst out yesterday the whole left crank came off.. luckily I was sable to get to the LBS and they put a new bolt on but warned that it may not last too long. I looked at the inside of the crank and good see that the metal had been deformed under pressure, but nothing too severe. So today whilst out with my mates, the same thing happened.. so I whipped out the 8mm key and gave it a damn good tightening, and amazing it held on for about 30 miles. However, I could still here creaking/ ticking, especially on steep climbs. My question is, do you think should just upgrade it now to a sealed crank like the lbs recomended, or leave it and it might be ok? Anyone know how much it would be to upgrade roughly, obv. it depends on the crank.. but any ideas??

cheers

What kind of crank/fitting do you have?

 

[roadiewill]

Not certain, but its made by Truvativ and is on the 08 SCR3 ... its not one of those closed cranks, its got a gap between the crank and bottom bracket... know what i mean?

 

[Gerry Attrick]

If the only thing worn is the inside of the crank arm, i.e. the soft alloy rather than the splines or square on the bottom bracket, I would be inclined just to replace the chainset provided the bottom bracket bearings are ok also.

 

[rnscotch]

I had the same problem with my Truvativ bb, even getting a new bb never resolved it i bought a shimano chainset and everything has been ok since.

IMO truvativ is crap..

 

[Gerry Attrick]

I had the same problem with my Truvativ bb, even getting a new bb never resolved it i bought a shimano chainset and everything has been ok since.

IMO truvativ is crap..

I bow to your opinion as I have no direct experience with Truvative.

 

[jonathan ellis]

I snapped a crank sprinting from some lights, as an experienced heap on the floor I'd be inclined to replace

 

[Kirstie]

If the inside of the crank arm where it fits onto the BB axle is in any way deformed it's sh*gged and will never work properly again. You need to get a new crank.

 

[Greenbank]

Yup, you'll probably need to replace it. Maybe even the BB if the spindle is equally worn.

If you'd tightened it up when you first realised it was loose then you might have got away with it, but riding with a loose crank just exacerbated the problem.

 

[bof]

I'd replace the BB at the same time - they are fairly cheap items - as the spindle may be b*ggered too