These are our all new seat clamps, coming in 2 sizes, 31.8mm and 34.9mm. Please do your due-diligence before buying this product as it will not work if your seat-clamp is the wrong size. And we may not be able to take returns depending on your circumstance.
A mountain bike (MTB) topcap is the small but essential component that sits at the top of your bike’s headset, right above the stem. It’s used to preload the headset bearings and keep your steering smooth and secure.
STEP 1:
To swap your top cap out effectively, loosen the pinch bolts on your stem before taking apart your cap. Then loosen the headset top cap.
STEP 2:
Replace top cap and tighten the top cap on, your top cap acts as a compression mechanism to ensure your headset is tight before your stem clamps it all together, therefore it is unnecessary to over torque this bolt.
STEP 3:
Generally 3-4nm will be perfect for tightening your top cap, If you don’t have access to a torque wrench a good gauge is to tighten the top cap until you can’t rotate the spacers under your stem with your fingers.
STEP 4:
Then tighten your stems pinch bolts and your ready to ride!
Rider Approved ✅
Let customers speak for us
from 160 reviews
I Love Hexcaps
Ive order twice from Hexcaps and both Ive had great service, my 2nd package was late, but I got a free top cap to make up for it!! Great products, great quality!
Please note: All orders placed now will be on hold and will not be fulfilled until February 4th, 2026. Thank you for your patience and understanding. Hexcaps Team!
 
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