23–24 January 2027 · Veliky Novgorod
ЗИМНИЕ ВЫХОДНЫЕ ВЕЛОКРОССА · 3ВВ
Два дня ТИПАЦИКЛОКРОССА: Cyclocross, Gravel, Fixed gear, МТБ и беговой кросс. Один день или оба.
Choosing a replacement brake rotor: beyond diameter
A rotor of the same diameter can differ in mounting, thickness and pad requirements. First distinguish a like-for-like replacement from a brake-system change. The latter needs additional checks.
1. Collect five identifiers
Record the rotor, hub, caliper and adapter models, plus the fork or frame model for the relevant brake. Add rotor diameter and pad model. A mounting photo is useful, but an exact model code is more reliable than visual similarity.
Check whether wheel installation, contamination or another damaged part is causing the problem. The brake-rub guide helps describe the symptom; buying a rotor does not guarantee a fix.
2. Match mounting and thickness
Center Lock and six-bolt are different mounting systems. For Center Lock, also check the lockring, axle and tool clearance in the hub documentation. Do not assume an adapter is permitted: confirm the exact combination.
Match the new rotor’s nominal thickness to the caliper’s permitted rotors. The old rotor’s minimum thickness is a wear limit, not a target specification for a purchase. Do not borrow a value from another brake model.
3. Check the whole system when changing diameter
The new size must be allowed by the fork or frame, caliper and correct adapter for that mounting position. Use the specified hardware and bolt lengths. Wheel diameter does not determine the maximum permitted rotor size.
A larger rotor is not a workaround for a faulty brake. If the required size is absent from the documentation, obtain manufacturer confirmation before buying. Do not modify mounts or stack arbitrary washers to force alignment.
4. Check pads and commissioning
Check pad shape and compound against both caliper and rotor requirements. Respect any rotor restriction on pad material. Contaminated pads do not become suitable merely because the rotor is new; use the manual and inspection to decide on replacement.
After installation, check mounting and alignment and follow the manufacturer’s bedding-in procedure in suitable conditions. A long descent or traffic is not the place for a first test. This guide gives no universal torque or bedding-in routine.
5. A request for the seller or mechanic
“Hub __, axle __, brake __, pads __, fork/frame __, current adapter __ and rotor __. Proposed rotor __, diameter __. Please confirm mounting, thickness, permitted size, pads, adapter and bolts/lockring, with documentation.”
If any interface remains unknown, keep the request and resolve it before ordering. The workshop directory can help you find diagnosis and installation services; a listing does not mean that workshop has approved this combination.
