seatpost/saddle problem

[shahardot]

Thought I'd try to use some of your experience in solving a problem I've got on my new bike set (just bought Kona Kula Supreme 18" 2008 frame):
I've got Thomson's zero layback seatpost and I've "eaten up" all my rail's space, and I need to get my saddle about 1 cm farther away (backwards) from the handlebar.(Using WTB Silverado saddle).

The reason I can't replace the stem is because it wont solve the problem I'm trying to overcome: my knees are a bit too forward when I set the crank arm vertical to the ground.

Should I be looking for a saddle with longer rails (if thery're, which ones ? XC racing) or do I have to replace the seat post to the laid back version ?

 

[swampy1970]

Thought I'd try to use some of your experience in solving a problem I've got on my new bike set (just bought Kona Kula Supreme 18" 2008 frame):
I've got Thomson's zero layback seatpost and I've "eaten up" all my rail's space, and I need to get my saddle about 1 cm farther away (backwards) from the handlebar.(Using WTB Silverado saddle).

The reason I can't replace the stem is because it wont solve the problem I'm trying to overcome: my knees are a bit too forward when I set the crank arm vertical to the ground.

Should I be looking for a saddle with longer rails (if thery're, which ones ? XC racing) or do I have to replace the seat post to the laid back version ?

You answered your own question right at the end. You need a seatpost that'll put your saddle further back.

Thompson posts are great but their setback post looks rather odd.

If you find your saddle really comfy I wouldn't go changing it for something else.

 

[longfemur]

Zero setback seat posts aren't really meant for most bikes. As you have found out, most bikes are designed with the assumption that the saddle will sit on a clamp that is behind the seatpost itself. Just get one like that, and you will be fine.