Originally Posted by
ps2fixer
A lot of people throw on 450R rear hubs because it makes the stance wider (more stable but worse for turning). Personally I love the stock width on the 3 wheelers, I tried 1.5in spacers on each side once and it felt horrible to me. I ride hard though and push the limits a bit and my skill level. I'm not sure how the 400ex hubs are vs stock. A lot of Honda rear hubs will likely interchange, at least that's true for most 3 wheelers besides the shaft drive models with the axle tubes.