- When Black Turns Purple – Hope Rotor Content
Mine haven’t gone purple “yet” but my disks have gone rusty !
Been out twice since fitted new, once at Dalby where I noticed it the day after that first ride then again after my Peaks ride on Fri afternoon ?Posted 4 years ago
All orange surface rust in the holes and the inside and outer edges ?souldrummerMember
When I was rebuilding my Dialled Alpine after the re-spray I put new Hope floating rotors on my wheels (Hope hubs DT rims). Both the spiders/holders were black anodised when they went on, but for some weird reason the rear one has turned purple. I haven’t cleaned the bike, so no chemical have been near it, and I have only been riding around the North Downs/Surrey hills, so there’s been no huge heat build up, so I am at a loss to know how this has happened. I will send it back to Hope in the fullness of time, but does anyone on here have any ideas how it could happen??Posted 4 years agothisisnotaspoonMember
All orange surface rust in the holes and the inside and outer edges ?
More likely metal from sintered pads tranfered to the disk.
Most (automotive) brake disks are steel or cast iron as it has a very high coefficient of friction, MTB’s use stainless for some reason, possibly strength.Posted 4 years ago
The topic ‘When Black Turns Purple – Hope Rotor Content’ is closed to new replies.