Cyclist Weight Limits:

• Chromoly Frame: 280 lbs.
• Titanium Frame: 240 lbs.   
• Carbon Fiber Frame: 210 lbs.

The Carbon Rails are not meant for MTB and Gravel. It is best for Tri and Road. It is super light and has a rider weight limit of 210 pounds.

The BiSaddle Chromoly and Titanium rails are round and will fit all seat posts including side clamp, top clamp and stationary bikes (Peloton). The BiSaddle carbon fiber frame has oval rails and will only fit top clamp seat posts or posts specifically made for oval rails.