Torx keys

Torx keys fit star shaped bolt heads. More and more bike and e-bike parts use them, and a hex key in a Torx bolt will strip it, so a small set is worth having alongside your hex keys.

What it's used for

• Disc brake rotor bolts. Rad lists T25 Torx for the RadWagon 5 rotor bolts at 6 to 8 Nm (Rad RadWagon 5 manual). See clean and true brake rotors.
• Seat clamps. Park Tool says many clamp bolts take T25 (Park Tool). See set saddle height.
• Brake levers, derailleurs, stems and chainring bolts. Park Tool lists these among the parts with Torx fittings (Park Tool TWS-2).

What to look for

• The sizes your bike uses. Check your manual's torque table for the sizes it names. Park Tool's TWS-2 covers T7, T9, T10, T15, T20, T25, T27, T30 and T40 (Park Tool TWS-2).
• Bits for your torque wrench. For rotor and stem bolts, use a Torx bit on a torque wrench to hit the spec.
• Seat the key fully. Push the key all the way into the bolt before you turn it. A half seated key rounds the star.

Best price we found

• Park Tool TWS-2 Fold-Up Torx Compatible Wrench Set at Park Tool: $29.95, checked Nov 9, 2026

Prices change often, and a local shop may match them.

Where to buy

1. The tool maker, such as Park Tool.
2. A large bike retailer.
3. A local shop, through find a shop.

Guides that use it

• Check the bolts on your e-bike
• Set saddle height and position
• Replace disc brake pads
• Clean and true brake rotors

Sources

• Park Tool TWS-2, parktool.com
• Rad RadWagon 5 manual, cdn.shopify.com
• Park Tool, parktool.com

Stuck after these checks? Find a shop near you.