Steat posts

Diver-m

I apart form getting the right size.

How do I know whether I need a Setback or Straight post.

Apart form the obvious and getting something that looks like what was supplied with the bike, which looks like it is a setback as it has a single bolt behind the post, so the head curls backwards to accommodate this, is there anything else I should check

redddraggon

Only you know whether you want a setback or non-setback post. It looks like you have a setback post, and if you're happy with it I'd recommend setback post.

Of course whether or not you need setback is a function of your anatomy/flexibility and seat tube angle - personally I go for a non-setback post on my 73deg seattube bikes.

maddog 2

if you've never experimented with moving your seat forward/backwards and have no inclination to do so, then just buy a post that looks similar to your currently seat and and set it up the same.

Many people find they want to move the seat back, beyond what an inline post can manage - or it simply starts to look a bit odd - so plump for a bit of layback.

I run an inline on the mtb, a layback on the roadie, but it all depends on everything (body shape, flexibility, riding position, frame angles, planet alignment, breakfast menu...)

Monty Dog

The amount of layback is a function of the frame seat tube angle, crank-length, the length of your femur and your flexibility / riding position - so I'm afraid there's no hard and fast rules.