24 Transition Relay size GX size large with extra battery. It’s an impressive light E-bike weighing 44 lbs when purchased from Highland Cyclery. With the impressive feel of the Fazua motor system it really hides It's weight and feels like an analog enduro bike with the bonus of just the right amount of assistance. The Fazua system has been great and I have no major complaints. I purchased a second battery for big days and it will come with the bike. Bike is setup as full 29er but is mullet compatible. Just about everything is of the stock Carbon GX build with the exception of better XT 4 piston brakes. Bike has 800 miles on it with a good portion of those miles being road miles as I did a lot of riding from my house because why not it's an ebike! Bike is in great shape except for some some paint chips by the bottom bracket. Transition has made something special with the Relay, it will not disappoint!