2G uses a 5mm guide pin designed to fit perfectly inside a Quick-release axle

you can visit the Tacx cloud website

make sure your specific trainer will accommodate the width of the thru-axle equipped bike that you are using

Zwift and other indoor cycling apps

and available in a variety of sizes to suit rider preferences

Serfas DDM-CT Dual Density Comfort Men's Saddle Steel Black Orange Seal 2G uses a 5mm guideThe Serfas Dual Density line of saddles is constructed using their patented I. C. S. (Infinite Comfort System) technology. Made up of a soft flexible rubber base followed by two layers of soft and firm closed cell foam, and a final top layer of friction reducing Reactive Gel covered in moisture wicking four way stretch Silk Tech Lycra. Features Serfas Silk Tech four way stretch moisture wicking Lycra cover, Dual Density Progressive Foam Technology,