I think the belly pan has marks to indicate the cuts to make. Brian, didn't you do yours?
As David says, seats are very subjective so here are some opinionated views:
- Standard seat - numb nuts after an hour as you slide forward, and eventually find that you (they!) have settled there permanently.
- Powerbronze - looks comfy, but was just painful. Vinyl stretched over a plank would be a cheaper way to get the same effect
- Sargent - never tried one, but Brian swears by them. But he swears at everything.
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Richtea custom - weirdly high for my long legs, but pleasant.
It's best to try and borrow one for an hour. You could try min, but you're quite a way off.