I am going to try this one more time and then give up. I have owned 40 trikes. I have owned many with the Peerless differential axle (mostly Pryers and also Tri-Rads) and many more with the standard American Tri-ped freewheel solid axle. There is NO COMPARISON on speed, on accelearation, on handling, on everthing. The freewheel is the cheapest, fastest, most reliable, lightest, best turning ...yada yada yada. Please do not waste your time and money on al;l this expensive stuff that only diminishes the enjoyment of the trike.