Bell St Coburg is bumpy as. It's all the traffic going in the same lanes when crossing it - the tarmac gradually develops channels in the direction of traffic. Same thing on Hoddle St if crossing it at right angles. And St Georges Road. Bounce bounce as you go over the bumps. A car with good suspension doesn't notice it, but on a bus or a bike it can be a wild ride. No cure other than complete resurfacing which ain't gonna happen anytime soon. Mind you, there are some Dyson buses with square or triangular wheels I tell you true.