Impact of Vibration on Rider Fatigue
There's been a fair bit of research done into impact of whole body vibration and hand arm vibration on rider fatigue, but it's usually directed towards automotives. It's a very complex issue, with different frequencies having different impacts, and even sinusoidal vs consistent amplitude being significant.
I did find a study out of China regarding motorcycles, which found that riders are consistently exposed to levels of vibration significantly higher than automotives, and exceeding the maximum recommended guidelines for autos.
This got me wondering if vibration is a big part of the fatigue I experience at higher speeds where the tach has to be at 6k+.
I've been eyeballing NC700s as an upgrade, and having an engine that produces peak torque at 4750 RPM is suddenly much more appealing. I wonder if that would translate to a lot less vibration and thus less fatigue.
Anyway, something I'm pondering today, so I thought I'd mention it here.
Also consider that a single cylinder engine will produce more harmonic vibrations than what a twin or four cylinder engine will.
Personally I've found that the higher frequency vibes from multi cylinder bikes are more likely to send my hands numb than those I get from my CBR250R. Heated grips help, on two counts: firstly the warmth but also their increased diameter helps spread the load over my hands better at lower speeds.
Last year on my trip to Scotland I had two days each with over 8 hours spent at 7000rpm and thankfully no numbness or fatigue. In fact I'm sure my CBR is smoother at 7000rpm than 5000.
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