I'm very susceptible to monkey butt. I mean I can't get out of town without my beadriders. I have the largest size on my f6b.
First some things you may not like.
1. You can easily slide back and forth.
2. You may find them hard on your butt.
3. They add slightly to seat height about 1/4 inch.
4. The cat gut can break and in seven years this is my second beadrider seat cover.
5. I'm six feet and on a good day weigh 155 lbs. A heavier body on the hard beads
may not be as comfortable.
What I like.
1. I can easily slide around on my seat as I'm kind of antsy.
2. Sliding around on the seat actually messages my butt aiding circulation.
3. They raise my butt about 1/4 inch so I don't sit in a puddle and never had to wipe
rain off the seat.
4. I never get monkey butt as long as what I wear is breathable which for the last
couple of years are Klim gortex pants. Jeans work even better.
5. The seat on the f6b is long and there is on my bike eight inches from the front of
the seat by the tank to the start of the beads. So that gives me the choice of
sitting on the beads or sitting on the beadless front of the seat.
My advice is get the largest and also get a couple of the Rok type straps they sell as on the f6b You need three tie down points per side.
.