in need of a new chainset

freeride-mike

Ive managed to twist the splines or wear them out in my deore cranks so have pretty bad forward n back movement causing the crank arms to not be inline deffinetly time for a new chainset but what to buy.. budget is £100 needs to be a triple and most importantly they gotta be stronger than crappy deore, whats people's reccomendations??

cheers for any input

mike

poah

got an SLX M670 from merlin for £95

http://www.merlincycles.com/bike-shop/m ... inset.html

cooldad

Depends what you've damaged. Deore HTII are by no means crappy.
SLX use the same axle system, just different cranks.
What did you actually break?

freeride-mike

by the look of it the splines are worn/twisted inside the crank arm

cooldad

What crankset? Sounds like you were riding with it loose.

Ouija

Like Cooldad says, modern deore are Hollowtech II bottom brackets, so the rhs crank is permanently fixed to the axle. I'm guessing you've got an old deore set with an ocatalink style bottom bracket with splines on either side of the bottom brackets axle.

freeride-mike

cranks/chainset is shimano deore 10spd and it is hollow tech II with the splined tube connected to chain ring side, wasnt loose only had them off a few weeks ago to put in a saint bb, bolts and bearing adjustment screw done up correctly

is the material used to make slx arms the same as whats usef to make deore??

cooldad

freeride-mike wrote:

cranks/chainset is shimano deore 10spd and it is hollow tech II with the splined tube connected to chain ring side, wasnt loose only had them off a few weeks ago to put in a saint bb, bolts and bearing adjustment screw done up correctly

No they weren't.

freeride-mike wrote:

is the material used to make slx arms the same as whats usef to make deore??

Aluminium? Yes.

cooldad

But the axle is steel, and I'm sure the crank insert is too.

freeride-mike

advice and or reccomendations for a replacement chainset was what i asked for not a lecture on my bike maintance skills.. as previousley said bolts were done up 'correctly' so that is'nt the issue the strength/quality of the crank arm material is.. if slx arms are made of the same aluminium as deore they arnt goin to be any better for the extra £55 price tag!

from wot ive read deore/slx/xt are 6000 aluminium (soft) however cranks like the saints are 7000 (much stronger) but nice condition saints in the req'd size are hard to find in my budget

rockmonkeysc

Deore are about the toughest cranks Shimano make, the rest are just lighter. If you ruined them you will do the same or worse to any other crankset.

freeride-mike

POAH wrote:

got an SLX M670 from merlin for £95

http://www.merlincycles.com/bike-shop/m ... inset.html

cheers dude

The Rookie

As stated though, they will be no 'stronger' than Deore, so if they are installed incorrectly then they will get knackered as well.

Ouija

Shimano are also very specific about the way you tighten up the pinch bolts on those cranks. Pre-tension the pinch bolts slightly and then turn each bolt a quarter turn (tightening one pinch bolt causes the other to go slack but don't be tempted to turn if further because of this) in alternating sequence until they meet in the middle. If one pinch bolt is screwed in further than the other, then the one that isn't is prevented from applying as much pressure as the other and the arm can wiggle it's way free or turn on the axle, bending the spines (because it slips).

Giraffoto

freeride-mike wrote:

advice and or reccomendations for a replacement chainset was what i asked for not a lecture on my bike maintance skills..

They're trying to help you avoid a recurrence of the problem. Regardless of whether you've tightened it up by the book or made a total bodge (we're not here to judge), it's a good idea to check every couple of weeks if it's still tight.