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Discussion Starter · #1 ·
as the title would suggest, I already own the m970 chainset but its getting time to replace all chainrings, these cost about £180 for all three. I know I can get blackspire for less but thats not the point. there are no other issues with the cranks particularly just slightly old and bashed about a bit.

I can get hold of a set of brand new Truvativ noir 3.3 team gxp carbon crankset for £180 and just need to get new BB90 bearings and spacer to fit for £23.

My questions really revolve around anyones personal experiences with the truvativ noir. I want to stick with the triple 9 speed as I am set in my ways and love the flexibility it offers on a 22.32.42 with a 11-32 cassette.

I could sell the m970 to pay towards the new noir too. any opinions on this possible change?

cheers
 

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My suggestion would be to buy a complete Shimano Deore XT M770 chainset. £120 from Chain Reaction Cycles with free delivery.:)

http://www.chainreactioncycles.com/shimano-xt-m770-triple-chainset/rp-prod20679

Functionally it's the same as your XTR chainset and it should include a new bottom bracket in the box also.

Truvativ noir 3.3 is an older carbon chainset. It's not even vaguely worth paying £200 (including new BB90 bottom bracket) for one.
 

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Discussion Starter · #3 ·
thanks for the tip but functionality isnt all i'm after, its weight, durability too. I wouldnt need the BB if I went for the XT anyway as I have a nearly new BB90 press fit BB and the xt would just slot in to existing bearings. the noir has a different diameter spindle hence the need for a new BB.

why do you say the noir is not even vaguely worth paying £200 for (inc new BB) do you have personal experience of owning one? I am aware that the noir is an oldish model but then so is the m970.

Could you explain what you base your opinions on please as this would be more helpful to me than just saying it's pap.

thanks
 

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The problem with the Truvativ noir 3.3 chainset is that it's carbon fibre, which sounds lightweight but that particular chainset isn't.

Compared to your current Shimano XTR M970 chainset (786g approx incl 93g bottom bracket) a Truvativ noir 3.3 chainset (816g approx incl bottom bracket) is heavier so if weight is your priority you would be spending £200 on a carbon chainset to add weight to your bike.

Shimano XTR M970 weight:
http://weightweenies.starbike.com/listings/components.php?type=cranksets&sortby=real

Truvativ Noir 3.3 weight
http://weightweenies.starbike.com/forum/viewtopic.php?t=44725

http://www.bikeradar.com/gear/categ...ct/review-truvativ-noir-xc-3-3-team-09-30949/

If money is the priority then it doesn't make sense either. Buying a complete Shimano XT M770 chainset (854g incl bottom bracket) is much cheaper, not much heavier than the carbon Truvativ, gives you the proven Shimano shifting ramps on the rings for good front changes and will last for many years.

The other drawback of having carbon fibre crank arms is that they can be vulnerable to damage if you catch the bottom of the crank arms on anything. You'd want a set of Race Face crank boots on top to protect the ends of the carbon cranks from strikes, something that isn't necessary with an aluminium Shimano chainset.:)

http://www.raceface.com/components/parts/crank-boot/crank-boots/

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