anyone know the weights?

trying to work out if its worth twice the price

Not purely for the weight saving in my experience. I recently put a Deore 3×9 on my commute bike and it was only 50-60g heavier than the XT it replaced.
The chainrings do seem a bit low rent, but the cranks are nice for the price. The BB looked/weighed exactly the same.

Got mine in a bundle (chain, cassette & chainset)from Woolyhatshop.
The cassete was really heavy though!

M770 XT with 3 rings and BB was approx 853g with 2x alloy and 1x composite rings.
M660 SLX with 3 rings and BB was approx 889g with 1 alloy, 1 composite + 1 steel ring.

M770 9-sp XT 11-32 Cassette was 256g
M660 9-sp SLX 11-32 Cassette was 282g

Shimano HG73 chain approx 290g
Shimano XTR chain approx 290g
SRAM PC991 chain approx 300g
YBN Hollowpin chain approx 280g
KMC X9SL chain approx 260g

PaulD

SLX 44-32-22 9spd (inc. BB) claimed is 889g
[XT ’08-’11 44-32-22 9spd (inc. BB) claimed is 853g]
BB’s are the same. XT inner is alu. instead of steel, XT middle carbon/steel? rather than compostite/steel? XT outer lighter too. Must account for most of the 36g diffference

no idea on deore. BB will be fairly similar to the SLX/XT one but iirc they will have different part no.s?
Deore has completely steel inner/middle rings? alu. outer?
Crankarms I think are forged rather than hollowtech (hydroformed?)

SLX and XT middle rings have the same part number on their tech docs, despite being described differently….marketing/smoke/mirrors.

BBs are BB70 at 95g, Deore is BB51 at 97g.

XT has 22g alloy granny ring versus SLX steel at 40g.

PaulD

XT 9 speed M770 32T middle ring = 1J1 9802

SLX 9 speed M660 32T middle ring = 1KF 9804

looks like a deore crankest & bb is 995g so hardly anything in it weight wise

“995g so hardly anything in it weight wise”
-889 = 106g
a lot or not a lot?

certainly much better £/g than between XT>SLX

Mister P,

Shimano have changed the .pdfs and the part numbers since I saved mine to disc.

I concur with current parts but maintain they are both carbon/steel composites. If one were glass fibre versus carbon their weight would be significantly different and they are not, both being 60g new.

I have a mixed bag of new spares that come up the same weight and look physically identical.

The 10-sp are labelled differently as Dynasys but otherwise seem identical.

PaulD