How quiet can one get a 15-20 mph bike?

[AndreasWinsnes]

Noise reduction is first priority, more important than speed, but the bike must be able to climb steep mountain roads, like in the Alps, carrying me and a backpack, at around 200 pounds combined, so what is the lowest decibel one can get in these conditions, having the best engine and muffler when price is almost not an issue?

 

[Deleted member 12676]

an expansion chamber designed for these bikes for low rpm power, that has a belly stinger, can be 84% quieter.
see http://www.dragonfly75.com/motorbike/torquepipe.html
unfortunately no one sells these and so you have to fabricate one yourself.

 

[AndreasWinsnes]

Thanks for reply! Unfortunately I can't use a motorized bicycle since I just discovered that all of them are illegal in my home country, Norway...

I know, it's crazy.

 

[KenM]

Have you looked into electric bikes ? Strong, very quiet . And you should be able to find Stromer bikes over there everywhere , I would think. They are very good. Hope this helps. Keep looking up! Ken.

 

[AndreasWinsnes]

Yes, but electric bikes need charging and not easy to do that while traveling in the mountains. Waiting 4-6 hours at a gas station while charging batteries every second day is rather boring.