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I'm need to replace my drivetrain and I plan on running a Dura Ace 7800 10spd chain. I haven't decided on my 9 spd cassette. Which is lighter and which will perform better for me?
 

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I've had the XT for over a year, took me through 1.5 winters and I rode London-Paris on it during the summer + all the training. Its just looking like it could do with replacing but has been super reliable and its a decent weight. If your looking for cheap + light weight (but with a bit of gearing lost), why not try 11-28 slx with a alu lockring? Comes in at around 222g
 

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The best shifting I have ever used was XTR M970 Shadow RD, Sram PG990 Cassette and KMC X9 SL Ti chain sooooo smooth and quite too.
 

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Why do you want to use a 10spd chain? The KMC X9-SL Ti is light, shifts well, and has lots of proponents.
 

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The X10 is lighter and just as strong apparently.

Not used an XT, but I have just replaced my PG990 with an XTR (both 11-32). Not sure the XTR is worth twice the price. Never had a problem with the SRAM - got over 2,000 miles out of it - think it looks better than the XTR too.
I would imagine that the XT and PG990 perform very similarly. They also cost about the same, but the XT is slightly lighter - 20g or so.
 

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Do the Ti cogs on the XTR wear out before the rest of the cassette or does it wear evenly since the middle steel cogs are used more and are smaller?
 

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I have had both. They are very much the same. Where I live the XT is a bit less expensive. Also lighter. For these reasons I prefer the XT. The SRAM scores higher on the "looks" department.
 
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