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You have deciphered my post accurately. I did reduce the diameter of the shaft and then flatten both sides of the reduce diameter shaft. I did use a micrometer to measure but the reduced diameter shaft ended up being about 5/16” long. I have read others have just expanded the frame. I thought...

I bought my motor from EBW also. I thought about widening the frame but chose to reduce the shaft shoulder on the free wheel side by 5/16 inch. I believe the term for the gear set on the rad runner is free wheel hub not cassette. The mechanisms are different. Either a single speed or multi...

When I did this same upgrade to the bafang 750 on a single speed rad the new motor’s axle would not even fit back into the frame! Seems you did not have this problem? Where did you buy you motor and what is the O.L.D spacing? I had to modify the axle shoulder to fit. I did have the same problem...

Thought some might be interested in e-biking in Denali National Park in Alaska. The National Park Service issued the e-bike directive at the end of August 2019 allowing ebikes in Denali National Park on the roads. With 92 miles of road it would be quite an adventure to do the entire Denali park...

Part of the experience of Denali Park is encountering the local wildlife. We saw wolf, moose, grizzly bear, caribou, rabbits and ground squirrels. Probably could have seen more birds like ptarmigan if we would have looked harder. Its a good idea to carry bear spray just in case but typically the...

See my related post here: https://electricbikereview.com/forums/threads/gear-upgrade-for-radrunner.33173/post-318164. I think or maybe should say have experienced what EBJ mentions about the fit between the rear dropouts or Over-Locknut-Distance (OLD). If you have a different experience with...

Just joined this group today. Pretty new to electric bikes less than a year but am hooked. own, well the wife own a Radrunner. We had recent adventure on ebikes in Denali Park in Alaska. 7 ebikes, 8 people including 1 toddler, 4 dogs, 3 days, 100 miles, 4000 ft increase in elevation. Was a...

I have, or well, my wife has a rad runner single speed. I just put a electro bike world bafang 750 watt motor and bolton kt8 screen and 35a controller on it. The screen and controller replacement was relatively easy and was a big improvement since she had the low end display without the digital...