Truvativ Blaze Arm fell off on Carerra Fury

mickisup

Kind of spoilt today's ride as half way round the (lh) crank arm fell off. Found the bolt that keeps it in place but appear to have lost what surrounds this and holds in place, possibly crank arm cover too but I can't recall whether there was one there in the first place. :oops:

Can anyone tell me what I need to purchase to fix this and what tools I need to ensure a good job.

Thanks

nicklouse

what BB fitting?

pics?

i imagine the self extracting bolt assy.

nicklouse

edit: not a two piece. take the other bolt out and see if you have lost anything as you may not have.

mickisup

Here is a picture, with the part that I am sure is missing indicated by the arrow.

bennett_346

Yeah you've lost the screw that holds the inner self extracting screw in. You need it so that when you undo the inner one, it doesn't just pull that out and pulls the crank arm off instead.

nicklouse

powerspline never had self extracting bolts.

you will have just lost the bit of plastic.

do as i said above take the other bolt out and compare.

cooldad

I think it's just a dust cover.
Need to check bolts regularly.

mickisup

Is there a name of the plastic bit lost and can I buy a replacement?

nicklouse

mickisup wrote:

Is there a name of the plastic bit lost and can I buy a replacement?

have you identified what you have actually lost?

pop into your LBS or just ride your bike.

bennett_346

Ah apologies thought it was GXP at a glance.

mickisup

I have tightened up the bolt holding the crank arm in place but there is too much play in the arm now, wondering whether the part missing does a specific job and not just as dust cover. There is a thread inside the BB that I am sure has a purpose.

nicklouse

mickisup wrote:

I have tightened up the bolt holding the crank arm in place but there is too much play in the arm now, wondering whether the part missing does a specific job and not just as dust cover. There is a thread inside the BB that I am sure has a purpose.

then your arm is dead.

have you looked at the other side yet?

it will answer your questions.

mickisup

yes, on the other side there is the same bolt holding it in place and a black o-ring around it, no dust cover as such. On the image above where the arrow is is where this o-ring sits

nicklouse

so as i have said it is a dust cover and you need new cranks.

mickisup

Can I buy singularly, does it have to be the same as comes off. Has I damaged a thread and that is why there is the play? I still need the dust cover, would that be purchased separately to the crank? Thanks for the advice, I will be more careful in future with this and check more regularly.

cooldad

You might find one on Ebay.

mickisup

I take it there isn't a common size, or will any Truvativ fitting suffice? Sorry for the ignorance, I am pretty new to this!

nicklouse

It is power spline and that is only truvative fitting. But truvative use other fittings as well.

Pop into your lbs and ask.

If they are anything like us they will have a few in bins somewhere.

mickisup

Will do, thanks again for all the answers and advice, lesson learnt! Cheers

The Rookie

Have some spare powerspline cranks off a Carrera and a spare dust cover, so PM me if you can't find what you want!