At my last job we looked into using a chain tensioner like this on a bicycle. It didn't work because of the chain stays where in the way. I don't think this is a good option.
this is very interesting. i like how the back fork angle is very small and the seat stay is very low to the frame. it looks like a cross between a monty 231 and a CZAR 20"
the rotor is a ashima from taiwan. they do a lot of oem for other companies, such as rockman bikes. you may see them with different branding here and there.
as for the rotor noise, it depends on the type of noise. if you're brake...
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