How to Measure a Bicycle Hub to Avoid Mistakes When Buying/Upgrading a Strummer Hub

The Hub Strummer is designed to be universal and can be installed on all bike brands. The most important thing to avoid getting the wrong hub is to measure the hub that is already installed on the bike. This measurement will serve as a reference when purchasing the Hub Strummer.

Recommendation: Open this page on a large screen (landscape) for easier reading (especially in the table section)

Tools and Equipment Needed:

1. The bike along with the wheelset you want to measure.
2. Vernier caliper / Caliper Gauge (digital type is easier to use).

Step 1: Removing the Wheelset and Checking the Wheelset Locking System

1. Remove the front and rear wheelsets from the bike to obtain measurements more easily and accurately.
2. Check whether your bike's wheelset locking system uses a quick release skewer or thru axle. Follow the guide according to your bike's wheelset locking system.

Example: Quick Release Skewer (QR) System	Example: Thru Axle (TA) System

Measurement Guide for Bicycles with Quick Release Skewer (QR) System

1. Note: this guide is suitable for quick release skewer systems with a 5 mm axle diameter.
2. Measure the width of the front and rear hubs according to the image below.
3. Measure the diameter of the hub end cap (the part that attaches to the frame and fork). Usually, this diameter is 9 mm for the front hub, 10 mm for the rear hub.
4. Note down the size to help you purchase the right components (Example: Front Ø9x100 mm, Rear Ø10x135 mm)
5. Compare the size you have obtained with the Strummer hub table below.

Step 2: How to correctly measure the hub width for a bike with a quick release skewer (QR) system	Step 3: How to measure the Outer Diameter of the End Cap (QR system)

 Measurement Guide for Thru Axle (TA) Bikes

1. Measure the diameter of the front and rear thru axles. Sometimes this diameter size is already written on the axle.
2. Measure the width of the front and rear hubs according to the image below.
3. Note down the size to help you purchase the right components (Example: Front Ø15x110 mm, Rear Ø12x148 mm)
4. Compare the size you have obtained with the Strummer hub table below.

Step 2: How to correctly measure the hub width for a bike with a Thru Axle (TA) system. Measure from the left end to the right end.	Step 1: How to measure the axle diameter on a bike with a thru axle (TA) system. You can also measure the inner diameter of the hub.

 Hub Strummer Size Table

Hub Strummer	Hub Size	Category	Available Adaptor (End Cap Sold Separately)
HM-280 (Front) HM-350 (Front) HM-380 (Front) HM-650 (Front)	Ø9x100 mm	MTB (Disc Brake)	Ø12x100 mm Ø15x100 mm
HM-280 (Rear) HM-350 (Rear) HM-380 (Rear) HM-650 (Rear)	Ø10x135 mm	MTB (Disc Brake)	Ø12x142 mm Ø10x142 mm (Ø10x141 mm Compatible)
HM-350 Boost (Front) HM-650 Boost (Front)	Ø15x110 mm	MTB (Disc Brake)	Ø9x110 mm
HM-350 Boost (Rear) HM-380 Boost (Rear)	Ø12x148 mm	MTB (Disc Brake)	Ø10x142 mm
HM-380 Boost (Front)	Ø15x110 mm	MTB (Disc Brake)	N/A Note: Not compatible with front hub adapter HM-350 Boost.
HM-650 Boost (Rear)	Ø12x148 mm	MTB (Disc Brake, Microspline)	Ø10x142 mm
HR-10 4-Pawl 20/24H (Front & Rear) HR-20 4-Pawl 20/24H (Front & Rear) HR-100 6-Pawl 20/24H (Front & Rear) HR-200 6-Pawl 32/32H (Front & Rear) HR-10 Ratchet 20/24H (Front & Rear) HR-20 Ratchet 32/32H (Front & Rear)	Ø9x100 mm (Front) Ø10x130 mm (Rear)	Road (Rim Brake)	N/A
HR-360 (Front)	Ø12x100	Road/Gravel (Disc Brake)	Ø9x100 mm
HR-360 4-Pawl (Rear) HR-360 Ratchet (Rear)	Ø12x142	Road/Gravel (Disc Brake)	Ø10x135 mm Ø10x142 mm (Ø10x141 mm Compatible)

Bicycle & Strummer Hub Compatibility Table

This table is created to assist potential buyers in the hub purchasing process. The bicycles listed below are not brands owned by Strummer. Strummer is not involved in the production process of the bicycles listed below. Therefore, buyers are responsible for double-checking before purchasing a Strummer hub, as bicycle manufacturers may change specifications without prior notice. Typographical errors/information may also occur in the creation of the table below.

If your bicycle is not in the table below, please contact us or the nearest dealer for further assistance. Prepare your front and rear hub size data (as shown in the guide above).

Bicycle	Compatible Strummer Hub	Compatibility & Description
POLYGON Xtrada 5 2x10 (2021-2022)* Xtrada 6 1x11 (2020-2022)* Xtrada 6 2x11 (2021)* Siskiu D5 2x9 (2019-2022)* THRILL Vanquish 3.5 (2011)* TREK Marlin 4 (2022)	HM-350 (Front & Rear) HM-380 (Front & Rear)	Plug and Play (except for types with an asterisk, please read further information) An additional adapter (end cap) is required (available, sold separately) for the rear hub with a size of Ø10x142 (5.2x142)
PATROL 093 Alloy (2021) 094 Alloy (2020) C091 (2021)  C092 (2021)  C093 (2021) POLYGON Heist X7 (2021) Siskiu D6 (2021) Siskiu D7 (2021) THRILL Fervent T140 Elite 11s (2021) Ravage Elite (2021) Ravage 1.0 (2021) Ravage 2.0 (2021) Ravage 3.0 (2021)  Ricochet T120 1.0 (2021) Ricochet T120 2.0 (2021) Ricochet T120 3.0 (2021) UNITED Clovis 5.10 (2021)	HM-350 Boost (Front & Rear) HM-380 Boost (Front & Rear)	Plug and Play (Works without additional adapter)
POLYGON Siskiu T7 (2021) Siskiu T8 (2021) Xtrada 7 1x12 (2021-2022)* Syncline C3 (2021)* SANTA CRUZ Bronson XT (2021-2022)	HM-650 Boost Microspline (Front & Rear)	Plug and Play (except for types with an asterisk, please read further information) * Only the rear hub. ** Requires purchase of 32H rims, as the stock rims from the bike are 28H.
POLYGON Helios 200 (2012)* Helios 300 (2012)** Helios 400 (2012) PACIFIC Primum 9.0 (2022)***	HR-10 4-Pawls 20/24H (Front & Rear) HR-100 6-Pawls 20/24H (Front & Rear) HR-10 Ratchet 20/24H (Front & Rear)	Plug and Play (except for types with an asterisk, please read further information) * Original bike rims 24/24H, so only the rear hub is suitable. ** Original bike rims 16/20H, thus requiring new rims for front and rear hub. *** Needs replacement of rims and spokes for front and rear hub.
POLYGON Bend R2 (2021) Bend R5 (2021) Strattos S5 Disc (2020)* Strattos S5 Disc Strattos S7 Disc (2021-2022) Strattos S8 Disc (2021-2022) Tambora G4 (2023) Tambora G5 (2023) Tambora G7 (2023) Tambora G8X (2023) UNITED Gavriil (2021) Sterling R1 Disc (2021-2022) Sterling R2 Disc (2021-2022)	HR-360 4-Pawls Centerlock HR-360 Ratchet Centerlock Please adjust the number/combination of holes on the desired hub and rims.	Plug and Play (except for types with an asterisk, please read further information) * An additional adapter (end cap) is required (available, sold separately) for the rear hub with a size of Ø10x135 (5.2x135). If you want to use a non-centerlock rotor (6-Bolt), a Strummer centerlock to 6-bolt adapter is available and can be purchased at the nearest dealer.

F.A.Q. (Frequently Asked Questions)

Q: What does Strummer mean if there is a size of 5.2x100?
5.2 is the inner diameter of the Strummer end cap for bicycles with a quick release skewer (QR) system. Meanwhile, the outer diameter of this end cap that attaches to the bike frame/fork is usually 9 mm for the front hub, 10 mm for the rear hub.

Note: This guide is not yet finished, so the information is incomplete. This guide is written in Indonesian. If you are reading this guide in another language, it means the guide has been translated by a computer and there is a possibility that the translation is not 100% accurate.