The Honda shaft is not only longer, but different in shape. Also.. A Transmission on a Titan or any other engine makes it a moped, scooter, motor cycle and no longer a bicycle. In order to be a bicycle it can not have a transmission. You CAN put a CVT or other type of transmission on your engine and get away with it until that one educated cop catches you. Then there will be trouble. From what I understand, an engine less than 50cc on a bicycle does not change anything, and is still a bicycle. If you have an engine with a transmission that allows the changing of gears or gearing, it is no longer a bicycle. I must admit, the thought of a CVT on a Titan XC would be awesome. Speeds of up to 45mph maybe 50? Also it could climb great as well !! This is all great stuff.. Problem is.. It violates most laws in most states for bicycles. So.. For now.. I will stick with the Current Titan with 5:1 reduction gear box. You can climb great and still get a top speed of 30mph. 30mph on most bikes is more than fast enough. Although.. 40-50 using a cvt would be a thrill.. And..Here where I live, an illegal thrill... Unless you register your bicycle as a Scooter, have a license, and pay the fees.. Then it would be legal.. So.. Hummm..... That is an interesting thought for the legal riders like me that would have the license and pay the fees.. But still.. For most bicycles.. Going close to 50mph on a bicycle is dangerous. very.... Keep in mind this, those that do such things as putting a transmission on a bicycle and not registering them and paying the fees, when caught, the local government considers it tax evasion. No kidding. And it is serious. Very serious... So.. I guess if you are going to do it, then register it and pay the fees and stay out of trouble. Thanks..Enjoy the ride....