Thanks for the info, I was wondering what rear diameter was sort of the limit for the 150 before it bogged it down too much. For now i have the Carter 2-bolt head, small valve Sym in stock form, though Tom indicates despite the lack of aftermarket support parts-wise is a pretty nice little screamer as is.
The same seller i bought the fronts from has 2 different styles of 22" x 8 rears. Most likely will go with a set of those. The new suspension, while a little narrower than the original single arms i made, is still plenty wide. I also pushed out in front about 2.5 inches, i have a lot of room for tire--i could probably stick 25s up there lol ... My thinking on the 10s is more for putting disc brakes in and getting a better tire selection. The sunl has a set of hydraulic discs in 8-inch front rims. I was just looking at the offset 8-inch rims i've had to move to, i may be able to copy the sunl setup if i can find the discs and calipers. i have a buddy who has his own welding biz who could Tig a set of threaded aluminum lugs onto the backside of the golf cart hubs to mount the brake disc on.
Rears i'm looking at, pretty similar tread, 4 vs 6 ply and b vs c load rating (can't find a chart to indicate what those weight ranges actually are ...) I'm assuming the 4 ply will be a bit lighter?
http://www.ebay.com/itm/270945504966...84.m1423.l2649
http://www.ebay.com/itm/350553500547...84.m1423.l2648