[mr_dove]

what does it take in order upgrade the size of the rotor from the smaller size to the newer 8" rotor?

Does it require a different brake assembly, adapter, or just the rotor?

 

[Surly]

New rotor and a new adaptor. Caliper and lever stays the same.

 

[Brian HCM#1]

You gotta make sure you fork can handle the larger rotor.

 

[dwnwrd]

What do you mean by "handle"? As in fit? Or tollerate the increased torque?

 

[KonaDude]

It requires the appropriate adapter, and an 8" rotor.

As covered in many previous threads, fork disc mount strength is not an issue, although you may have the wrong fork if you feel the need to put an 8" rotor on a Rock Shox SID....

 

[Carbon Fetish]

Originally posted by dwnwrd
What do you mean by "handle"? As in fit? Or tollerate the increased torque?

Both. Some frames can't take more than a 6" and some forks cannot handle the stress from the torque of an 8" (standard drop outs). There has been a long debate about running 8" rotors on standard dropouts. Many manufactures like Marrocchi say not to. They had people breaking axels and pulling their wheel off of the drop out while riding etc. But, there are some people on this board *cough* who don't care what the lawyers say and make their own adapters to run those 8" bad boys.

 

[ohio]

Originally posted by mr_dove
what does it take in order upgrade the size of the rotor from the smaller size to the newer 8" rotor?

Does it require a different brake assembly, adapter, or just the rotor?

depends on the brake you're running, but for hayes:
new adapter, new rotor

for hopes
new caliper half, new rotor

shimano/grimeca
add-on adapter, new rotor

magura:
???

you're walking in some sketchy warranty area of you put an 8" rotor on a QR fork, but plenty of people have done it. Just use good skewers and make sure they're tight (both of which I think you should do anyway). I recommend Shimano or Salsa QRs.

 

[amateur]

most brakes just need an adapter and rotor

qr+8" is not as sketchy as some make it out to be. on most forks(mine at least) there are little nubs on the bottom on the dropouts so that even if the skewer comes undone, it'd have to unscrew really far to fall out.

 

[KonaDude]

Originally posted by Carbon Fetish


Both. Some frames can't take more than a 6" and some forks cannot handle the stress from the torque of an 8" (standard drop outs). There has been a long debate about running 8" rotors on standard dropouts. Many manufactures like Marrocchi say not to. They had people breaking axels and pulling their wheel off of the drop out while riding etc. But, there are some people on this board *cough* who don't care what the lawyers say and make their own adapters to run those 8" bad boys.

How would a person break an axle by running 8" on a QR fork???

 

[Carbon Fetish]

Originally posted by KonaDude


How would a person break an axle by running 8" on a QR fork???

Honestly, I don't know. I think the tech rep said that to me just so it would scare the customer into not doing it at all. But, I wouldn't doubt the front wheels could be pulled of because of the 8 inch.

 

[KonaDude]

Originally posted by Nobody
It's not the issue of 'breaking axles' but, rather, the issue of loosening QR (lightweight shyt, 'delrin' type anti-friction rockers, etc - best QR, bar none, is XT/XTR - by far the strongest clamping mechanism. Mavic are good, too, but pricey) allowing the wheel to shift slightly and 'wedging' the caliper - this is Hayes particular beef with it.

The other, that I've been made aware of (inside track) is also related to QR's coming slightly loose - backside of the dropouts crack and fail.

Bigger rotors are not the panacea people think they are. That's because 95% of 'Bike Shop Monkey/Enthusiast Rider' guys don't know what the physics of disk brake operation is all about.

Terd-burglar-Zonic-sheMan was quoted as saying that large riders don't put as much force into their brakes as any (including much lighter) Pro riders do. So much for physics.

Dude, didn't you hear? The laws of physics don't apply to bicycles or their parts.