I have an old 2007 Trek ZR 2100 that I am thinking about converting to a commuter bike. It doesn't have the pegs on the seat post/fork for mounting a bike rack and trunk bag. I'm leaning towards the topeak MTX system, but wasn't sure if putting the rack on and max of 20 pounds would be bad given the OCLV carbon fork. I would have to add a seat post collar with the posts for mounting the stabilizer bars. Is this a bad idea? I have another road bike currently, and was trying to prevent having to buy another bike for commuting. Thanks for any advice!

Ryan

work arounds commonly used: P clips , a rack mounting via the QR skewer

and a band clamp for the top of the seat post that also included Threaded Mounting Ears as Well .

If it works why would it be a Bad Idea ?

Topeak MTX rack attached to seat post. It's just the standard mounting hardware plus a p-clamp and piece of inner tube around the seat post



As for general capacity, I've carried 45 lbs on that rack in rear panniers. Topeak rates the MTX capacity at 55 lbs. Not sure why a carbon fiber fork would be a problem. All the weight is on the rear wheel.

The bike has carbon stays and fork, right? And it probably can't take a fender or a little fatter tire.

One thing is clear, you can commute on anything. My advice, though, is sell it and buy a used bike that can take fenders and a rack for commuting and is a little more lock friendly.