I'm looking at the new line of cassettes, 970s and 770s. From what I read, the weight difference seems to be only about 10 g or so. Can people comfirm this?
That is correct. The reason its not any lighter is because the XTR 11-32 uses 5 arms. The XT 11-32 uses 4 arms(I have both cassettes). Thats why the $59(and then get 10% off that lots of times) sale 11-32 XT cassettes aren't bad deals.
loose 10 more gms(=250gms) by using an alum lockring.
"I've breathed the mtn air, man" Johnny Cash
It's a long way to the top
. . . if you wanna rock and roll (ac/dc)
That is correct. The reason its not any lighter is because the XTR 11-32 uses 5 arms. The XT 11-32 uses 4 arms(I have both cassettes). Thats why the $59(and then get 10% off that lots of times) sale 11-32 XT cassettes aren't bad deals.
loose 10 more gms(=250gms) by using an alum lockring.
So would the 5 arm XTR be stronger? I hear so many horror stories about the large rings bending.
From what I read, the weight difference seems to be only about 10 g or so. Can people comfirm this?
I think you'll find it's a bit more than 10gr. M760 XT is 260gr (or 250gr with an al lockring) and M970 XTR is 222gr. I don't think the M770 cassettes are any lighter than M760.
I think you'll find it's a bit more than 10gr. M760 XT is 260gr (or 250gr with an al lockring) and M970 XTR is 222gr. I don't think the M770 cassettes are any lighter than M760.
XT 11-32: 263g including steel lockring (save about 10g with a aluminium lockring)
XTR 970 11-32: 223g
as we all know only the larger sprockets of the XTR are titanium. i just replaced the remaining steel cogs of the XTR with the same size Titanium cogs of my own Ti-cassettes and the result isn't all that bad: 189g
If you don't climb really steep hills, you could just go with a Dura-Ace CS-7700 in 12-27.
Should be under 180g .
Unfortunately I wasn't able to find a 20T granny for my XT crank, but there are some out there available for other types of cranksets - just to keep your ratio as close as possible to 22/32.
If you don't climb really steep hills, you could just go with a Dura-Ace CS-7700 in 12-27.
Should be under 180g .
Unfortunately I wasn't able to find a 20T granny for my XT crank, but there are some out there available for other types of cranksets - just to keep your ratio as close as possible to 22/32.
that is the exact route I took except with a 11-23 Dura Ace.. but I'm in the midwest of the USA without any major mountains to ride nearby.
Another plus with the Dura Ace 11-23 is more appropriate gearing for pavement/snow pounding during the winter months.
Used an 11-27 Duraace(added the 11t) for about 3 race seasons. Ran a 42-30-20t setup. The problem isn't the granny. The problem is the middlering. Since I'm in the SE mtns, with the 11-27, I had to go to the granny way too often for my taste. Plus massive chainsuck was experienced with the 20t a lot of times. Now back with an 11-34XTR, I never go to the granny(back to 22t's) for an XC race. Only on bigger stuff like ORAMM(11000' vertical/63 miles), etc do I ever need to go to the granny. The FD is the weakest link to a given bike and every time one goes to the granny your exposing one self to the chance of a dropped chain, chainsuck, etc plus they sometimes won't shift under power like when your too late dropping down into the granny(which happens alot with a road cog and in mtns) because your oxygen dept'n in a race and forget(one more 'big' extra thing to think about in the heat of battle). ymmv.
"I've breathed the mtn air, man" Johnny Cash
It's a long way to the top
. . . if you wanna rock and roll (ac/dc)
Used an 11-27 Duraace(added the 11t) for about 3 race seasons. Ran a 42-30-20t setup. The problem isn't the granny. The problem is the middlering. Since I'm in the SE mtns, with the 11-27, I had to go to the granny way too often for my taste. Plus massive chainsuck was experienced with the 20t a lot of times. Now back with an 11-34XTR, I never go to the granny(back to 22t's) for an XC race. Only on bigger stuff like ORAMM(11000' vertical/63 miles), etc do I ever need to go to the granny. The FD is the weakest link to a given bike and every time one goes to the granny your exposing one self to the chance of a dropped chain, chainsuck, etc plus they sometimes won't shift under power like when your too late dropping down into the granny(which happens alot with a road cog and in mtns) because your oxygen dept'n in a race and forget(one more 'big' extra thing to think about in the heat of battle). ymmv.
Have you compared a 30/27 (31.1") ratio to a 32/32 (28") in gear inches.. not much difference, just about like shifting down from a 29 to a 32 cog in the back on a standard tripple set up. Don't understand why you allways needed to jump to the granny ring with such a small gear inch difference in your two set ups??
Appears you might need to adjust your FD inside limiter if you are dropping chains.. I've never had the problem on either my moutain or road bikes unless of course the FD is out of adjustment or the cable has stretched.
Never said I dropped chains. I said theres always that "chance".
I run a 30/34, not a 32/32. Thats low enough for about anything at XC race pace. At least for a short but intense 1.5hr XC race. Some topend loss of course..but thats what the bigring is for. Longer races like the above mentioned, 12 hr solo's(on certain courses), etc still could require the granny sometimes tho.
"I've breathed the mtn air, man" Johnny Cash
It's a long way to the top
. . . if you wanna rock and roll (ac/dc)
I bought mine from Toronto Cycles on ebay. It's an SRP model that has been in use happily for three years and many cassettes. I'm surprised by how long it has lasted to be honest.
Or you could hit up your LBS and see if they have any left around from dead XTR/990 cassettes.
XT 11-32: 263g including steel lockring (save about 10g with a aluminium lockring)
XTR 970 11-32: 223g
as we all know only the larger sprockets of the XTR are titanium. i just replaced the remaining steel cogs of the XTR with the same size Titanium cogs of my own Ti-cassettes and the result isn't all that bad: 189g
Your cassette looks great, but it is a bit pricey... have you thought about selling the smaller cogs from your cassette seperately as a costs saving option to add to an XT/XTR cassette?
By the way... I think your posts on the forums are some of the most informative! Keep up the good work!
Your cassette looks great, but it is a bit pricey... have you thought about selling the smaller cogs from your cassette seperately as a costs saving option to add to an XT/XTR cassette?
By the way... I think your posts on the forums are some of the most informative! Keep up the good work!
sure - i have these smaller cogs to fit shimano cassettes ! i'm just waiting for the 13t cogs to arrive which were missing in the delivery i got. but that was my plan to have enough spare cogs for those looking to upgrade XTR cassettes.
LinkBack URL
About LinkBacks
Reply With Quote
Originally Posted by Duckman
