Brake Adapter Fitment Guide

Looking to get the right brake adapter but can't figure out which darn'd post mounts your fork and frame use? We've been there, so we compiled this database full of post mount specs for popular forks and frames our customers have been searching for.

Getting the right size brake adapter seems tricky at first, but it's very simple. Your brake adapter needs to take up the difference between your fork's post mount size and the rotor size. If your fork or frame has 180mm post mounts and you want to use a 200mm front rotor, then you need a 20mm brake adapter. Just subtract your post mount size from your rotor size to get your brake adapter size.

Rotor size - Post Mount size = Brake Adapter size

Just about every brake manufacturer makes their own brake adapter, and we recommend getting the same brand adapter as your brake caliper. While most calipers work with most brake adapters, use the same brand to guarantee compatibility.

Forks

Fox

Fork	Post Mount Size
32 and 32 Step-Cast (2017+) 34 (2018-2022) 34 Step-Cast (2022-2025)	160mm
34 (2022-2025) 36 (2016-2025) 36 SL (2026+) 38 (2020+)	180mm
36 (2026+)	200mm
40 (2016)	203mm

Marzocchi

Fork	Post Mount Size
Bomber Z2	160mm
Bomber DJ Bomber Z1	180mm
Super Z Bomber Z	200mm
Bomber 58	203mm

RockShox

Fork	Post Mount Size
Pike (2013-2016)	160mm
Pike (2017+) Lyrik (2017+)	180mm
ZEB (2020+) Domain (2020+) Boxxer (2015+)	200mm

Ohlins

Fork	Post Mount Size
RXF 34 m1 RXF 34 m2 RXC 34 m1	160mm
RXF 36 RXF 36 EVO RXF 36 m2 RXF 36 m3	180mm
RXF 38 m1 RXF 38 m2 DH 38 m1	200mm

DVO

Fork	Post Mount Size
Diamond D1 Diamond D2 Diamond D3 Diamond E2 Diamond E3 Sapphire D1	160mm
Onyx SC D1 Onyx SC D2 Onyx SC E1 Diamond 36 D1	180mm
Onyx D1 38 Onyx DC D1	203mm

Manitou

Fork	Post Mount Size
Mattoc R8 R7 Circus Gen 3 Junit 34 Markhor Machete	160mm
Mezzer Mastodon Gen 3	180mm
Dorado	203mm

Cane Creek

Fork	Post Mount Size
Helm MKI Helm MKII	180mm

SR Suntour

Fork	Post Mount Size
Durolux 36 Auron 36	180mm
Durolux 38 Rux 38 DH	203mm

MRP

Fork	Post Mount Size
Ribbon SL Ribbon SL Rally Ribbon LT Raven Bartlett	180mm

Push

Fork	Post Mount Size
Nine.One	It's complicated.

Frames

Commencal

Model	Post Mount Size
Meta Power SX Bosch Meta Power TR V4	160mm
Tempo Tempo Power Meta HT V3 (XS)	180mm
Supreme V5 FRS Meta SX V5 Meta V5 Meta SX V4 Meta AM V4 Meta TR V4 Meta Power SX 400 Meta HT V3 (S, M, L, XL)	200mm

Crestline

Model	Post Mount Size
RS180 RS205	200mm

Devinci

Model	Post Mount Size
E-Troy Lite E-Troy Bosch Chainsaw Troy 2025	200mm
Spartan HP 2022+ Spartan (2019-2021)	180mm

Evil

Model	Post Mount Size
Epocalypse (2022+)	200mm
Following (2020+) Offering (2021+) Insurgent (2022+) Wreckoninig (2020+)	180mm

Forbidden

Model	Post Mount Size
Dreadnought V2 Supernought	200mm
Druid V1 Druid V2 Dreadnought V1 Druid CorE/LitE	180mm

Ibis

Model	Post Mount Size
Oso	203mm
HD6 HD5 Ripmo V3 Ripmo V2 Ripmo V1 Ripley V5	180mm
Exie Ripmo AF V1 Ripmo AF V2 Ripley AF V1 Ripley AF V2 Ripley V4	160mm

Knolly

Model	Post Mount Size
Chilcotin (2024+) Fugitive (2024+) Delirium (2024+) Warden (2024+) Endorphin (2023+)	180mm

Kona

Model	Post Mount Size
Process 153 (2024+) Process 134 (2024+) Process X (2020+) Process 153 (2018-2023)	180mm
Process 134 (2018-2023)	160mm

Norco

Model	Post Mount Size
Range (2022+)	200mm
Shore (2021+) Sight (2024+) Optic (2024+) Sight VLT (2025+) Sight VLT (2024) Sight VLT (2023) Fluid VLT (2024+) Range VLT (2024+) Range VLT (2023 Sight (2020-2023)	180mm
Optic (2020-2023)	160mm

Orbea

Model	Post Mount Size
Wild (2023+)	203mm
Rallon (2018+) Occam (2020+) Wild (2020-2022) Rise (2021+)	180mm
Wild (2018-2019)	160mm

Santa Cruz

Model	Post Mount Size
Nomad V6 Megatower V2 Bullit V1 Vala Heckler SL V1 V10 V7	200mm
Hightower V3, V4 Bronson V4, V5 5010 V4, V5 Tallboy V5 Megatower V1	180mm
Blur V5 Highball V4 Tallboy V4	160mm

Specialized

Model	Post Mount Size
Stumpjumper 15 (2025+) Levo Gen 4 (2026+)	200mm
Stumpjumper EVO (2021-2024) Stumpjumper (2021-2024) Levo Gen 3 (2022-2025) Levo SL (2024+) Enduro (2020+) Kenevo SL (2021+) Demo (2020+) Status 160 Status 140 Status 2 170 Status 2 140	180mm

Transition

Model	Post Mount Size
TR11 V2 Relay Alloy	200mm
Spire Patrol V3, V4 Sentinel V2, V3 Smuggler V2, V3 Scout V2, V3 Repeater EP8 Repeater PT Relay Carbon	180mm
Spur Sentinel V1 Scout V1 Patrol V1, V2 Smuggler V1 TR11 V1	160mm

Trek

Model	Post Mount Size
Slash Gen 6 Rail Gen 5	200mm
Fuel EX Gen 6 Fuel EX Gen 5 Slash Gen 5 Rail Gen 2 Rail Gen 3 Rail Gen 4 Fuel EXe	180mm

Yeti

Model	Post Mount Size
160E SB160 SB165 (MX) SB165 (27.5) SB140 (29) SB140 (27.5) SB135 (27.5) SB 130/130LR SB120 SB150	180mm
ASR	160mm

YT

Model	Post Mount Size
Tues MK4 Decoy SN MX Decoy SN 29	200mm
Capra MK1, MK2, MK3 Tuess Mk3 Jeffsy MK2, MK3 Decoy MK1, MK2	180mm
Izzo Jeffsy MK1	160mm

*this database is a constant work in progress and is subject to change at any time.

Still have questions? Feel free to reach out to us at sales@thelostco.com or 360-306-8827 for further assistance.

SHOP Brake Adapters

Fox Shock Mounting Hardware - The Lost Co. - Fox Racing Shox - 803-03-256 - 0821973390277 - m6x19 -

Sold out

Brake Adapter FAQ

How do I figure out what size brake adapter to get?

The Post Mount Size for your fork is the minimum rotor size, and if you want to use a 180mm brake rotor on a fork with a 180mm post mount, you will not use a brake adapter. Just install the brake caliper directly on your fork.

Rotor size - Post Mount size = Brake Adatper size

Which brand of brake adapter should I buy?

If my fork or frame has a 203mm post mount, can I use a 200mm rotor?

Unfortunately, you will not be able to use a 200mm rotor. You will need to use either a 203mm rotor without an adapter or a 220mm rotor with a 17mm adapter.

What is the minimum and maximum size rotors I can use?

The Post Mount Size of your fork is the minimum rotor size you can use, and most forks will work with all rotors up to 220mm perfectly. Step-Cast forks are a notable exception, and are not designed to be used with larger rotors.

What about IS brake adapters?

Older frames and some modern steel frames use a different style of brake mount. IS stands for International Standard, and getting the right brake adapter for an IS system is very straightforward. To mount a 180mm rotor on a frame or fork that uses an IS mount, you need a IS to 180mm brake adapter. Don't overthink it, just get the IS to X brake adapter where X is your rotor size.