The vibration is harmonic & actually starts a 37mph then demonstrates to 44mph under power, on level running, then gradually smooths out above 44mph. When running down a hill briefly with motor & drive train engaged, as if engine braking, absolutely no vibration at the same 37 to 44mph speed down the steep decline. No vibration felt up to 50mph running on level road.
The lithium pack or the rear rack/exhaust (they touch slightly) are my first thoughts as resonating surfaces, and though the old tires were fairly aggressive tread the Maxxi tread is quite different & may be the initiator. I mentioned in an earlier post that I haven't attached the rack to a forward brace point (fender brace tube on the seat stays) and I'll do that first. Engine and all other components are tight and seem to function perfectly till I hit that narrow speed range.
Side note is the bike tracks really nice at these higher speeds and feels much more stable with the frame extension drop outs. I'm seriously calling that mod a success!
Rick C.
The lithium pack or the rear rack/exhaust (they touch slightly) are my first thoughts as resonating surfaces, and though the old tires were fairly aggressive tread the Maxxi tread is quite different & may be the initiator. I mentioned in an earlier post that I haven't attached the rack to a forward brace point (fender brace tube on the seat stays) and I'll do that first. Engine and all other components are tight and seem to function perfectly till I hit that narrow speed range.
Side note is the bike tracks really nice at these higher speeds and feels much more stable with the frame extension drop outs. I'm seriously calling that mod a success!
Rick C.
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