Do Rotors Have Different Width Braking Surfaces?

[eep803]

Hi, I'm after a new 180mm rotor for my trail bike which is running deore 525 brakes with 6 bolt hubs. I look on CRC and they have XT 6 bolt 180mm rotors (http://www.chainreactioncycles.com/Models.aspx?ModelID=756) but someone asks a question about them being suitable for their deore 525s.

The answer comes back from CRC that they are not as the XT rotor has a shallower braking surface so the wider deore pads would get shredded by the rotor arms.

This business of different width braking surfaces is new to me, whats the crack there?

I've emailed CRC for clarification too but thought yous guys were pretty hot on techy details and it applies to my trials bike to as I have bunged any old rotor onto my bb5s and now wonder if they are "compatible"?

Cheers all, Skinny

[Al_Fel]

That's where the difference is mate. You should be fine with pretty much any combo though to be honest.

[N.Wood]

Never had a problem with a few caliper/rotor combos.

CRC are probably just covering their backs.

[davey1991]

This isn't really a problem.

BUT, the new hope vented discs are thicker and wont fit anything but hope v2's.

[Dan Clark]

I imagine that the stop-start braking of trials makes it matter even less, I could imagine it potentially meaning something on an XC or DH bike when you modulate loads.