Quick First Look at the 100/80 r16 Moto Tyres I bought for only £30 each!
I think these will fit but I know it won't be easy. I am not sure when I'll get to fit them but they are snow tyres so if it gets cold, they are going ON!
When I do a full review I will talk about the tyre sizing. But this is the closest we can get to 4" x 20".
100/80 r16 is 100mm wide by 80mm high but the 80 is actually the %age of the width but where the width is 100mm for 100% 80 does infact equal 80mm. SO anyway, this is the size, it's just going to be how hard are they to get on. I have heard that having them nice and warm will help so I will sleep with them before putting them on :)
And the other big issue could be the weight. I think the gyroscopic effect will be greater and breaking will be affected but also what will I do if I actually get a puncture when out and about! UH OH.