Masamune

In the wind tunnel, Masamune saves 15 to 40 W depending on position. The data is validated at AeroPerformance Lab.

Masamune weighs 249 g.

Masamune meets the ISO 4210-5 standard. Follow the assembly instructions and set your position with a professional.

Masamune is compatible with many Dual Stack bikes. Some models need an additional plate. Check the compatibility page or write to info@tetsuo.com with your bike details.

Tetsuo offers 30 days of free returns. Check the applicable conditions and contact the team to arrange your return.

We ship internationally. Check the options available for your destination at checkout. Taxes or duties may apply outside the EU.

Yes. You can pay in 3 interest-free instalments with Klarna or PayPal, depending on your country, for orders up to €2,000. In Japan, Paidy will be available from 18 November 2026. See the Pay in 3 page for the conditions in your country.

Masamune has a 2-year warranty. You can read the coverage and how to make a claim in our warranty policy.

Orders ship within 1–3 business days. Delivery takes 24–72 h in mainland Spain, up to 7 days to the Balearic and Canary Islands, 7–10 days to the rest of Europe and 5–10 days to Japan by express shipping, with duties included.

No. Follow our step-by-step assembly guide. For the best result, we recommend having your position set by a professional bikefitter — you can find one near you in our bikefitter network.