I just bought a Rad Mini 4 and a Step Thru 2. The ST, while in 7th year (and 6th to a lesser degree) shudders and vibrates severely. The derailleur and the High/Low stops are correctly adjusted, and I get good shifts up and down in all gears. However, when the bike is in 7th gear, the chain vibrates severely and you can feel shuddering in the cranks and the bike. You can sense it a little in 6th gear, but mostly in 7th gear. The remaining gears are smooth.
Any ideas? This does not occur in my Mini 4.
Any ideas? This does not occur in my Mini 4.