Sram XX - is 2 x 10 the future? « Singletrack Forum

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Sram XX - is 2 x 10 the future?

79 posts & 30 voices | Started 3 years ago by Dave | Latest reply from clubber

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Mr Agreeable - Member

10 speed works fine off road as shown by various mate's cx bikes coping absolutely fine with some horrendous conditions...

In terms of hours of use, even a season of CX races ain't that much though is it?

Tyre-kicking aside, I'd be interested to know how the front mech works on a setup that's designed from the ground up for dual ring use. I run 2x9 (but with no big ring) and the chain always seems to be dragging against the front mech if I shift up or down a few gears.

But the real question is, out of all the staff the mag could have sent to preview the latest top-end race groupset, why the one who rides a singlespeed and sings the praises of cheapness?

Posted 3 years ago #
njee20 - Member

I found the pic, clubber: YGM.

It doesn't look like ti, too 'white'. Middle chainrings work perfect well in alu, and considering the cassette weighs less than a 9 speed XTR one I think it's likely.

Posted 3 years ago #
clubber - Member

I'm not talking about cx racing but rather cx riding through the winter.

This is no different to 8 to 9 (or 7 to 8 or 6 to 7 or 5 to 6) - there are always (still...) people who say it'll be a disaster and never work and the reality never actually reflects that.

Posted 3 years ago #
smiffy - Member

nanodrive

Posted 3 years ago #
clubber - Member

Here we go (njee's pic)

Posted 3 years ago #
tinsy - Member

Get a lot more crap at the back, it wouldnt last like an alloy front ring, but I guess thats not its main priority as you say its damn light, think I would realistically be more interested in a lower in the range 10 speed setup that weighs more and lasts a bit longer.

But I fully understand why you would do the bling flagship model first.

Posted 3 years ago #
njee20 - Member

But an alloy middle ring gets used 50% of the time (all things equal), whilst an alloy cassette sprocket gets used 10% of the time.

Obviously it doesn't work anything like that, but you know what I mean!

Posted 3 years ago #
tinsy - Member

Fair point, something in my head doesnt like the sound of an ally ring in the cassette... Or surely someone would have done super light cassettes on the cheap before? Like the racer only ally discs.

Could just be me though...

Posted 3 years ago #
Northwind - Member

26/39 on the front with the 36T rear sprocket gives pretty similiar bottom gearing to 22T on the front and a 32T rear sprocket. 1.45 vs 1.38. I don't see that as a dealbreaker personally. Obviously you also lose a little top gear with that setup, but who cares?

If it's reliable, and once the prices are sane, I'd consider it myself I guess. We do carry around an awful lot of overlapping gears as it stands.

Posted 3 years ago #
clubber - Member

Also, alloy sprockets in the middle gears (eg 16 to 20ish) have a lot fewer teeth than 36 which is a big part in considering wear.

Posted 3 years ago #
njee20 - Member

KCNC do cassettes with alu sprockets, various other manufacturers do them too, they don't wear well, but no one's done a 36t sprocket before. They also tend to snap, but where the sprocket joins the carrier, the fact they've done away with the carrier makes me think it's alu.

Posted 3 years ago #
Northwind - Member

I guess it'll depend on the surfacinging as well, that can make a huge difference. This isn't pushbikes, but renthal make a hard anodised allymotorbike sprocket which lasts a little more than twice as long as most ally sprockets, and about 2/3 as long as steel if looked after. I assume something similiar could be used for mtbs, if it isn't already.

Posted 3 years ago #
tinsy - Member

I would love 36t on my bike, thats why I am interested, OK am convinced on the ally thing, 1x10, yeah sounds right to me, and not an overlapping gear in sight. Where do I sign up?

oh and need to see the shifter pods on their own, if you got a pic of that in your pocket!!

Posted 3 years ago #
UpQuickDownSlow - Member

Cranks are available in either Pressfit 30 or GXP, with a Q factor of 165mm

So the Pressfit/BB30 and GXP options both have a Q-factor of 165 mm? One of the advantages of BB30 is supposed to be reduced Q-factor.

Posted 3 years ago #
tinsy - Member

Your right northwind, I think clubber has got that sussed its the ammount of teeth MX sprockets are huge... I am now convinced, ally no trouble.. bring it on..

Posted 3 years ago #
Mr Agreeable - Member

This is no different to 8 to 9 (or 7 to 8 or 6 to 7 or 5 to 6) - there are always (still...) people who say it'll be a disaster and never work and the reality never actually reflects that.

My commuter with 7-speed gets used every day, never cleaned, left outside in the rain, and I typically get 3 years' use out of a drivetrain before I have to change everything. Plus it's a lot less sensitive to poor set-up and filthy cables than 9 speed gearing. And that's built up with stuff that's below even the level of Deore!

It's not a disaster that there's fancier stuff coming out, but each change gives pretty minimal performance benefits at the expense of reliability and longevity.

Posted 3 years ago #
bikerbruce - Member

bb30 is lighter as bearing go straigh into the frame...ie.no need for bb cups.
The q factor is suspect givern is for the bb30 anyway.

Posted 3 years ago #
Raouligan - Member

Shimano make a 12-36 cassette I think Madison have them on teh website, only deore level though.

With a White Induistries VBC chainset you could have it all now 9speed....

Posted 3 years ago #
njee20 - Member

Yes they've just started doing a 29er specific cassette with the 36 you're right.

I wondered if the chainset weight was for BB30, in which case it's not that impressive.

Posted 3 years ago #
tinsy - Member

great, was just about to buy a new cassette... OK then poke your 10 speed... until I can afford it at least!!!

Posted 3 years ago #
clubber - Member

BB30 chainsets seem to be coming out a bit heavier but apparently a lot stiffer...

Posted 3 years ago #
njee20 - Member

My S-Works one is 530g (plus bearings admittedly).

Posted 3 years ago #
Dave - Moderator

Not read all the comments yet but here's a couple of close ups of the cassette

http://www.singletrackworld.com/2009/05/that-sram-xx-cassette-in-close-up/

Posted 3 years ago #
Dave - Moderator

Front shifting is nothing like Duo, you can change when you want, under pressure up and down no problem. The rings are mathematically designed to have more pick up and release points than standard rings.

Posted 3 years ago #
clubber - Member

Interesting to note that it seems to be using the powerdome type fitting with splines only at the top and bottom - not good for alloy freehubs...

Posted 3 years ago #
Dave - Moderator

http://www.singletrackworld.com/2009/05/sram-xx-forks/

Fork story will be all there when I've popped over to the truck to take pictures.

Posted 3 years ago #
njee20 - Member

Doesn't actually seem to be that much of a problem with Red cassettes, I wonder if it's alright because it's 2 wider splines, as opposed to 4 thin ones, distributes the pressure more evenly.

Posted 3 years ago #
clubber - Member

Yeah, could be I suppose - twice as wide halves the load which is quite possibly enough to make all the difference.

Posted 3 years ago #
zaskar - Inactive

Nice option but wonder how much it will cost?

(-fed up of spending more money on bike than a car!)

Posted 3 years ago #
njee20 - Member

Someone muttered at £260 for a cassette I think it was. Seems about right, based on Red.

Posted 3 years ago #
clubber - Member

Yeah, but no one serious will be buying that - it'll be for sponsored riders and people with more cash than sense. The rest of us will be waiting for the X9 or X7 versions or using 10 speed Shimano.

Posted 3 years ago #
UpQuickDownSlow - Member

SRAM Red OG-1090 cassettes seem to be available from £120 - £145 online.

Cross-compatibility with SRAM road groups will be nice. Could use XX front derailleur plus chainset or rear derailleur plus cassette to put low gears on a road bike.

Posted 3 years ago #
Dave - Moderator

Standard Q is 156 compared to Noir which is 171 that's with a GXP b/b. The wider Q is to fit different frame designs.

Posted 3 years ago #
Dave - Moderator

But the real question is, out of all the staff the mag could have sent to preview the latest top-end race groupset, why the one who rides a singlespeed and sings the praises of cheapness?

Surely the obvious choice if you want the non-fanboy opinion

(I do own and ride geared bikes you know)

Posted 3 years ago #
Dave - Moderator

Images of the XX trigger shifter here;

http://www.singletrackworld.com/2009/05/sram-xx-shifter-close-up/

Posted 3 years ago #