forx and 8" rotor?

[Stanley]

which adapter do you need to fit a hayes 8 inch rotor to a fox forx?

[rfemurfx]

all you need to get is a Hayes 8" adapter for a I.S. fork. the same as all others, like boxxers, marzocchi's and so on.
-peace

[Stanley]

is there a difference between thru axle and quick release types?

thanks

[Yeti DHer]

i dont think you are supposed to run and 8" rotor on any fork that isnt a thru axel. The Thru axel makes the fork super stiff, and not move when you lay on the brakes. an 8" rotor on a QR Fork wouldnt work to well.

[shocktower]

The reason for you to only put them ( them being an 8" rotor ) on a through axle ,it is so you don`t snap or break the QR ,and then lose control of you bike :eek: :eek: :eek:

[Stanley]

hmmm... i see, thanx

[Joey]

I just tried to mount an 8" hayes rotor to my forx Vanilla 125 and it didn't go too well. I tries using the 20mm adaptor that was just a bit too wide and would make th disc rub on the adaptor. I was told my some friends that you can piggyback a 6-8" adapter for a manitou fork on the standard 6" adaptor and this will work (I guess that what's some Jr. T owners have done).

HOWEVER, I must agree with the above posts. I talked with guys from both Hayes and Fox and both say NO. They say a standard QR isn't up to the additional forces of the 8" rotor. Hayes says the reason you can't find an adaptor for an 8" rotor w/ QR is because they won;t make one for safety/legal reasons.

Still, I could use the extra braking power. Any ideas?

[Kilgore]

Well, if you want 5" with a single crown and also be able to run an 8" rotor, get a shiver sc. :D

[KonaDude]

Hayes now makes an adapter that allows you to run an 8" rotor on a quick release fork, although I've heard they still suggest against it.

I've done many mods to people who have requested it, allowing them to use 8" rotors on QR forks. Not one has had a problem. The 8" rotor feeds LESS force into the caliper, and the adapter may have a little leverage, but I doubt it would take the force up above what a 6" rotor would apply.

[rfemurfx]

i agree with kona dude that the 8" rotor apply's less force to the caliper , but the rotor applies more force to the wheel. may sound like the same thing but it's not. think of it as a crank. a single lever from the hub to the brake caliper, when the brake is applied the force is coming from the caliper tranfering to the rotor(8" rotor longer lever) then to the wheel which in turn transfers to the axle which is being held in place by a QR that is prbably not a shimano or mavic. is like applying a breaker bar at the caliper and forcing the axle out.
the thing is that a disc applies force so close to the axle that it trys to pull the wheel out of the drop out, the reason why last year you could not run qr20's w/o the tabs and this year with qr20+ you can. the drop-out is alot deeper. if you realy want alot of stopping power get some avids with 6" rotors. they are plenty strong. if you must get 8" rotors then get a 20mm thru axle.
there is a reason for everything.

[amateur]

why not just get a bolt thru hub? seems like itd keep the wheel in place. and if you've ever play with brakes on a wheel w/o a skewer in it, it gets torqued out of the dropout even at slow speeds.

[El Jefe]

Originally posted by Kilgore
Well, if you want 5" with a single crown and also be able to run an 8" rotor, get a shiver sc. :D Or a zoke qr20

[phlegm]

I recently sent an E-mail off to Avid asking about using 8" rotors with their disc brakes on a regular QR dropout. They said it would be fine...

I see a few manu's have also been spec'ing bikes with 8" mechanicals. Mostly Hayes though, which I've been told don't have nearly the amount of power an Avid has... so I have to ask, would an Avid mechanical have enough leverage to rip the wheel out of the dropout, or break/crack the dropout/disc tab?

Avid says it wouldn't be a problem. I'd also like to find out what Marzo says.

[rfemurfx]

i honestly do not know how much power the avids put out. i would say that if the caliper center sits slightly below the axle center, that would lessen the pulling force. so it would require alot more to pull the axle out. i would recommend to use a mavic or shimano skewer. they both have very good clamping power. but talking to the mfg's is the best place to start.