Chain slipping while pedaling hard

[brandt]

Hello all,

I received my rad runner about a week ago. One issue I'm trying to resolve is to figure out how to get the chain to stop slipping when I pedal hard.

Thanks!

[sc00ter]

My 'Runner 1 has a random "jump" when I get on the pedals. I think its the chain tensioner bouncing around and not responding quick enough. Its a Sturmey-Archer if I recall, and I would love to find a better quality one. But the "jump" decreased as I got some miles on it so I'm not really worried about to now. But if anyone finds a better tensioner that works on a "Runner 1 please share!

[Wojciech]

@scooter - did you manage to resolve the issue? I’ve opened a ticket with Rad support regarding the same and wondered how it ended for you. I’ll post an update when hear back from Rad, so far they’ve asked me for a video of the chain in motion.

[sc00ter]

Nope. I just put it down to the chain bouncing and the tension arm not reacting fast enough. So far my chain hasn't jumped off so its not a big concern, safety or reliability.

[Wojciech]

Thanks! And  has the OP? @brandt?

[handlebar]

My first few days, I thought the chain jumped occasionally. Then I noticed that while it happened only when I pedaled hard, it happened only at minimum torque: top dead center.

That's when i switch from pressing with my low foot to pressing with my high foot. When I pedal enthusiastically, my timing may be a little off, slowing the crank for a few milliseconds. Then my high foot drives the crankshaft forward, taking up the slack. The freewheel engages in increments that happen to be about the same as one link in the chain, so it can feel as if the chain jumped a link.

[bora]

I had a tensioner alignment problem. Chain slips were resolved after aligning.