Is this suitable for mounting a Fizik Aliante R1 saddle with carbon rails on my 2017 Trek Domane SL5?
Hi there, These are the 7x10mm ears, but the Fizik Aliante R1 carbon uses 7x9mm rails, so they aren't the matched pair for that saddle. Bontrager do a 7x9mm version of the same rotary-head ear, which is the one that suits the Aliante R1. The rotary-head clamp itself is the right system for a 2017 Domane SL5 seatmast cap, so it's just the rail size to get right. If you'd like, we can confirm the 7x9mm part for you via https://www.sigmasports.com/contact-us. Many thanks
