The wheels are 700's. The bike rides well and feels good but the frame is small. I am trying to work around that. I, replaced the original seat post so I, could raise it 2". I am now looking for a goose neck to raise the handlebars. All the bearings are tight. guess mileage would be 300 or less. If I, can get the bike to fit me am considering ceramic bearings. I, am 5'10" and weigh 215. will this bike carry my weight? I,found a pair of conti 3000, $2 ea. to put on. I'm looking for suggestions for upgrades for the bike. Also, any ideas on getting this bike frame to fit me better would be appreciated. A friend oiled my bearings with a home made non toxic oil. (prob veg oil concoction) I question whether I should ride the bike or not. Shouldn't the bearings be greased? Thanks for any responses.