Torque and Chrome

replacing seat post clamp?

Just bought a new road bike, and after putting the seat in place and tightening the clamp and sitting on the bike, the clamp snapped right in two. I didn't even tighten it that much, but I don't have a torque wrench so I probably did tighten it too much and that's why. I am going to go to my LBS today to pick up a new clamp, but am wondering what size I need. The seat post is 27.2mm, but the clamp size depends on the seat tube size correct? How do I measure this to tell the bike shop what size my seat tube is, or what information would I need to bring them to figure out what size seat clamp I need? I have the broken clamp, if I bring it in along with knowing my seat post size will that be enough for the shop to tell me what I need? I am trying to avoid bringing the whole bike into the shop just to figure out what clamp size I need.

Public Comments

1. If you tell them the brand and model of the bike and bring the broken clamp, they should be able to get the right size.
2. They should be able to match the clamp by holding the two pieces together.
3. most seat clamps are a one size fits all. but if its a road bike they have ones that don't use a wrench kinda what you find on a front wheel for the i think its called a fast clamp if i remember