We'll take care of you. Period.

It's our mission to provide you with world-class hospitality every time you visit us online or in-store. We're always here to help you. It's the Trek way.

30 Day Unconditional Guarantee

Ride it and love it, or we'll take it back. If for any reason you're not 100% happy with your trekbikes.com purchase, you can send it back within 30 days for a refund or exchange - no questions asked.

We're where you are!

With 50 Trek retailers across Ireland, you'll never be too far from a store.

Find your local Trek retailer here.

Trek Colour-Matched Matte Carbon Seat Mast Cap & 7 mm Round Ears

Model W600908

Offered in white and black and a variety of lengths and offsets, the mast cap includes hardware compatible with round saddle rails only. 7x10mm carbon rail-compatible hardware sold separately.

Product details

Ultra-light carbon construction
Direct fit on all Trek road bikes with round seat masts
Colour-matched for direct compatibility
One bolt head design offers easy fore-aft and infinite angle adjustment
Includes 7 mm round saddle clamp ears, 10 mm ears sold separately

If for any reason you’re not satisfied with a Bontrager or Trek aftermarket purchase, return the item, along with the original sales receipt to the original place of purchase within 30 days for an exchange or refund. Think of it as a 30-day test ride.

Learn more

Size	135mm x 5mm	135mm x 20mm	175mm x 5mm	175mm x 20mm
Length	135 mm	135 mm	175 mm	175 mm
Offset	5mm	20mm	5mm	20mm
Rail compatibility	7 mm round	7 mm round	7 mm round	7 mm round
Material	Carbon	Carbon	Carbon	Carbon

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. The prices shown are the manufacturer's suggested retail prices.

Weights are based off pre-production products at time of publication. Weights may vary in final production.