Disc Brake Mounts and Adapters
The +20 or +40 on an adapter is the number of millimeters it adds to your rotor size. Start from the size you run now and add the step you need.
Post Mount and Flat Mount
On a post mount, the caliper bolts onto two threaded posts on the frame or fork. On a flat mount, the caliper sits on a flat surface, which is common on road bikes.
Check your frame or fork before you buy, because the adapter has to match both the mount and the rotor size.
- Post mount adapters: browse the collection
- Flat mount adapters: browse the collection
- Shifter mounts: browse the collection
PM+20 Adds 20mm
Use a +20 adapter when you want the next step up in rotor size. Our PM-PM+20 weighs 13g and comes in silver and black.
PM+40 Adds 40mm
Use a +40 adapter to jump two steps at once. Our PM-PM+40 weighs 17g and is listed for these two moves only. PM+20 and PM+40 sit on the same listing, so tell us which you need at [email protected].
PM-PM+20-A for LHP Brakes
If you ride an LHP-U4, LHP-S4 or LHP-S6, this is the adapter we recommend. The PM-PM+20-A is CNC 7075 T6 aluminum, weighs 28g and covers 140 to 160, 160 to 180 and 180 to 200.
It comes in gunsmoke and black. The S6 caliper already has +20 built in, so count that before you add more.
Flat Mount FM-F for Road Forks
Our FM-F adapter is for road forks with a 70mm mount. It is integrated CNC cut from 7075-T6 aluminum and weighs 10g.
It installs at +0 or +20, so you can keep your rotor size or step up with the same part.
Direct Mounts for SRAM Shifters
A direct mount puts your shifter on the brake clamp, which takes one clamp off the bar. For SRAM Matchmaker there are two options, and the brake decides which one you need.
Our AE/AX adapter is for AE and AX levers. Our general SRAM adapter does not name a brake series, so ask us before you order it for another brake. Both come for left or right, in silver or black.
Direct Mounts for Shimano Shifters
Our I-Spec EV adapter fits Shimano I-Spec EV shifters. It is not compatible with LV series brakes.
Our I-Spec II adapter fits Shimano I-Spec II shifters and is right-hand only. I-Spec types do not interchange, so check the model number on your shifter first.
Quick Adapter Table
Find what you want to do, then follow the link.
| You want to | Use |
|---|---|
| Go 140 → 160, 160 → 180 or 180 → 200 | PM-PM+20 or PM-PM+20-A |
| Go 160 → 200 or 180 → 220 | PM-PM+40 |
| Keep or add 20mm on a 70mm road fork | FM-F |
| Mount SRAM Matchmaker on AE or AX | AE/AX adapter |
| Mount SRAM Matchmaker on another brake | SRAM adapter, ask us first |
| Mount Shimano I-Spec EV, not on LV | I-Spec EV adapter |
| Mount Shimano I-Spec II, right side | I-Spec II adapter |
Send Us Your Setup
Email us your mount type, your rotor size now and the size you want. We will point you to the adapter.
[email protected]