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I now understand x12, extra 7mm for the slots to drop the wheel in, thicker axle for stiffness, but is 135x12 a frame standard, or just a 135 and standard QR upgrade?
If your frame is set up for a normal QR, then doesnt this limit the axle diameter to the width of the QR?
One reason for asking is that I have a set of Hope 135 x 12 adaptors and wonder if they are any use as a potential upgrade on Ms AD's 135 x 10 Prophet (with Hope Pro 2 hubs0.
135mm by 12mm is a 'standard' but it's one that is being phased out by 142mm by 12mm.
135mm is as you know the spacing between the drop outs, so 142mm is the extra spacing you identify on the Syntace X12 system (I think syntace introduced the idea but it may have been someone else).
The 12mm is the diameter of the axle that goes through the hub and connects the wheel to the frame. 12mm has been the default for DH bikes since forever. They first went from 135mm spacing to 150mm (so that you could get less 'dish' on the rear wheel, but since no one bothered to move the flanges on theit 150mm hubs further apart, the idea was a bit redundant). Consequently a lot of DH bikes, like the ORange 224 Evo went back to 135mm width.
12mm through axles enable you to get a more secure connection between frame and wheel; the axle that goes through the hub almost always then screws into the frame, in the same way that the 12mm axle on a 142mm bike does.
If you have a QR 135mm frame, then unless you can swap the dropouts completely, i.e. on both sides of the rear triangle, you can't go from QR to 12mm through axle. Some Intense frames allow you to do that and the DMR Swapout system is designed to do the same. The adapters you have for the Hope hub will be of some use to someone but they are unlikely to be an upgrade for your partners Prophet; I don't think you can convert the Prophet to 12mm through axle but we can easily check.
Just remembered that Cannondale used to do the Prophet MX, which had a 12mm rear axle so it may be possible to convert a QR to 12mm.
But to be honest, unless you're being a bit of a hooligan, you're not going to notice the increased stiffness that the 12mm axle makes.
Thanks, pretty comprehensive.
Are your 135 x 12 adapters for the original Pro 2 hubs or the Pro 2 Evo? If they are for the latter and you don't need them then let me know as I am after a set.
My Scott Voltage has a 135x12 rear axle but it has bolt-on drop outs to alter the wheelbase or fit a standard 135mm QR wheel
Have got another set of drop outs meself they have come in handy for testing purposes i.e. putting trail bike wheels in but I prefer the 135x12 setup.
roverpig - they are Hope part HUB241, so for Evos. I fitted them by mistake and scratched one adaptor taking them off. If you post me a stamped addressed envelope, I'll let you have them.
splumleyATblueyonderDOTcoUK
That's very kind of you, thanks. I'll ping an email your way.
Cheers,
Andy