30 Day Unconditional Guarantee
For Trek, Bontrager and Electra products, if for some reason you're not 100% happy with your purchase, you can return it within 30 days for a refund - no questions asked!
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| Model | Trek Knock Block Headset 3 x 10 mm Spacers |
|---|---|
| Steerer outer diameter | 28.6 mm (1-1/8") |
| Thickness | 10 mm |