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Runwell 15M8Bolt is an M8 x 1.25 hub bolt made for hubs using hex-socket bolts. Its 15mm outer hex shape allows wrench tightening for better torque control, with a free-spinning crimped washer.
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The Runwell 15M8Bolt is a new style hub bolt developed for hubs that use hex-socket fixing bolts. It was designed to solve common issues such as not being able to apply enough torque, wheel movement under load, or stripping the hex socket when tightening too hard.
The 15M8Bolt uses an M8 thread with a 1.25mm pitch. Its 15mm outer hex shape allows it to be tightened with a Runwell 15mm wrench, just like a traditional track hub nut. Compared with standard 5mm or 6mm hex-socket bolts, the 15mm wrench interface provides more stable torque application and a more confident tightening feel.
The bolt is made from steel and features a crimped washer that spins freely. This design helps tighten the wheel securely while reducing scratches on the frame end contact surface. The product is designed to match frame end widths, with a 9mm contact shoulder diameter for the front version and 10mm for the rear version.
According to Runwell’s research, compatible hubs include Philwood, Mac and Raketa. However, hub screw hole specifications vary by manufacturer, so please check the thread specification of your hub before purchase.
Sold as a pair, this is a practical upgrade for fixed gear and single speed riders who want stronger wheel fixation, better service feel and a 15mm wrench interface instead of a standard hex-socket bolt.
Specifications
Brand: Runwell
Product Name: 15M8Bolt
Thread: M8
Thread Pitch: 1.25mm
Overall Length: 47mm
Thread Length: 30mm
Outer Hex Width: 15mm
Material: Steel
Weight: Front pair approx. 66g / Rear pair approx. 68g
Color: Black / Black Silver / Black Gold
Quantity: Sold as a pair
Front Contact Shoulder Diameter: 9mm
Rear Contact Shoulder Diameter: 10mm
Known Compatible Hubs: Philwood / Mac / Raketa
Features: 15mm wrench interface, free-spinning crimped washer, reduced hex socket damage risk
Notes
Front and rear specifications are different. Please confirm the correct installation position before use.
Hub screw hole specifications vary by manufacturer. Please check your hub thread specification before purchase.
There may be a hook mark on the middle of the thread from the surface treatment process. This does not affect use.
Although the product has good corrosion resistance, it may still rust if exposed to outdoor conditions or rain for long periods. Regular cleaning and maintenance are recommended.