Got a 2009 Yeti 575 Carbon and after reading various stories about rear end flex and then frames breaking its making me a bit nervous ... so ... as the wheels are pro 2's, would converting them to a 12mm through axel add stiffness and reduce the chance of the rear end flexing/breaking?
thanks
Has long as you use the bike in which its designed for then you should not have any problems.
All materials flex if not then snapping or fracture would be more common.
The rear Maxle would help But if your thinking of using this then are you riding harder
than the frame is designed for?
if you convert Pro2s to 12mm youll go from a flexy rear end to snapping axles...
You can't run a 12mm bolt thru axle on a 575. The biggest axle diameter you could run is 10mm. You could convert your Pro2 to 10mm Bolt-thru and then use a 10mm QR like the DT Swiss RWS skewers.
I ran that axle on a set of Tricon wheels and it was certainly stiffer than the QR wheels they replaced.
Will the pro2 convert to bolt up?
I know the evo does
yep. 10mm Bolt up or bolt through
I have converted my older, non-evo Pro 2 rear hub to 10mm bolt thru and then use a Superstar 10mm QR
Having owned a 575 for 2.5 years before I snapped it, I wouldn't describe it as flexy. It wasn't noticeable anyway.
I snapped it on the chainstay 2-3" behind the wishbone between the two chainstays (or whatever the little joining strut's called!). Drive side. They are known for snapping there apparently, and I had no difficulty obtaining a warranty replacement. If you've not noticed any flex yourself, then my advice would be not to worry. Mine lasted quite a while despite the hammering I gave it!
thanks all
will give it some more thought before any rash decision ...... didn't realise it only went to 10mm either so thanks for the heads up
steve
I changed my 575 from q/r to 10mm RWS and it was much better in the stiffness department. I wouldn't ever go back to standard quick-release on anything but a road bike now...
ive never noticed flex on a single bike ive had
flex is a marketing term designed to make you buy the latest model
I've run Pro 2s with bolt-through and bolt-in, couldn't tell any difference in operation but the bolt-in is pretty light compared to bolt-through + axle. Also requires 2 points to fail before the wheel can fall out.
That said, don't worry about flex unless you can feel it and it bothers you.
ive never noticed flex on a single bike ive hadflex is a marketing term designed to make you buy the latest model
*facepalm* the more i think about this the more stupid it gets. basically, youre wrong. Ive felt two 575s and the rear end flex on both was astonishing. also on one of them, the carbon has de-glued itself at the linkage 
Hadley do a nice axle that fits the Pro 2 bolt through. Being Ali it's much lighter than the Superstar 10mm Q/R if that bothers you. It's much more expensive as well though at about £30 from North West Mtb Centre.
basically, youre wrong.
im not wrong, ive just never encountered it, doesnt make me wrong
how much real world difference do you think a 9 to 10mm axle is going to make?
how much real world difference do you think a 9 to 10mm axle is going to make?
It's not so much the diameter of the axle, more the spindly qr that binds it together.
the danger of trying to reducing movement in one place is that you just create the opportunity for the forces currently creating the movement to move elsewhere and create bigger problems there.
Always seems to me that pushbikes just now are more or less where motorbikes were 12 years ago... After years of constantly driving to make things more stiff, we've passed the point where just adding stiffness is definitively good, and now some bikes are basically too stiff to the extent it hampers control- your Honda RC51 if you like. But marketing people still like "15% more stiff" so manufacturers will still keep on making stiffer bikes even if they work less well. Accurate tracking is good, but bikes that can deflect over and around obstacles are better (if you doubt it, remove your suspension)
Anyone else notice Nico Vouilloz talking about maching down maxles to make them less stiff in one of the mags?
Think you've got a point there NW about 'there is such a thing as too stiff'. That Nico V interview in MBR was one of the best mag articles I've read in a while.
Try to find an aly rear end or buy yourself some body armour for when the seatstay finaly lets go
I've had my older 575 for nearly 5yrs. The original chainstays developed a hairline crack within the 1st year, the replacement has been fine ever since. Yes it flexes, the newer one is supposed to be stiffer, but it doesn't detract from the ride. The only time its caused a minor problem was combined with wheel flex, 2.4 nobby nics rub when cornering hard, its now got 2.25.
If you want flexy, i can feel the back end of my P20 turn in after the front under hard cornering and its fully rigid!! Won't change it though
I had the older version of the 575 with a carbon rear end
the joint with the alloy bearing carrier at the swingarm end debonded after 3 years and was replaced with a later model rear end by Yeti
I don't think I ever tried to test the flex in the rear end so I couldn't really say if it was excessive or not
l certainly never noticed it whilst riding - maybe I'm not as rad and gnar as others?
im not wrong, ive just never encountered it, doesnt make me wrong
No, the wrong part was when you very matter-of-factly stated flex was a marketing term.
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