I have sun ez3 trike,it has rear freewheel with the largest being 28 teeth,can I put a mega range with 34 teeth on it,and do I have to change the deraileur.Objective to make hills easier.

  • 1
    Do you know what type of derailleur you currently have?
    – mikes
    May 30, 2013 at 0:31
  • The website only says Shimano for the rear derailleur. It doesn't specifically say which model. Also this lengthy review states a lot of upgrades that had to be done a similar trike from Sun
    – Zeus A.
    May 30, 2013 at 15:33

1 Answer 1


You do not indicate if this is the SX ("tadpole model" weighing 48 lbs) or the USX HD (weighing 65 lbs.) (Either curb weight is a challenge but if you've been spinning away at 80 or better rpm, I say "reward yourself with a lighter trike." Review the archives at http://www.rtrmag.com - Recumbent and Tandem Rider Magazine or The Recumbent Journal for alternative rides.)

Alternately, ask your LBS for an install of a 28 or 26 tooth chain 5-bolt chain ring that could provide 5% lower gear to pull hills. The Microshift FD will accommodate a granny gear change down to 26t ring but will not shift nicely with a 24 t. IF this EZ-3 is the USX HD, do not expect much improvement or success on inclines as the drive applies only to the right rear wheel and you'll be frustrated by its "crabbing to the right" while you're spinning frantically and working to redirect the steering.

  • Been there, done that, did not need the T-shirt. But my worst point with the EZ3 (I guess USX HD) was the fastest gear, I could never peddle it faster than 25 km/h, going downhill I had to relay on its weight to pick up speed.
    – Willeke
    Apr 18, 2015 at 19:10

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.