|
I'm guessing that it's my ROR that David is talking about so I'll throw in my choices and reasons.
When I built it, I used standard Bunnings 4" wheels and they ran on a rail. They didn't have bearings in them. The roof is 4 x 5 metres and made of steel with Zincalume roofing so yes, it's heavy.
I originally only put 4 wheels a side in but soon found that this was not enough. I added another 4 a side and it was OK but still sluggish and over time, prone to the wheels becoming a little eccentric and hard to get going.
I re-engineered the roof to run on vertical steel bar rails using castors with bearings. These are relatively small, about 50-60mm OD I guess. I set them in 50x50mm square steel box section with a spring-loaded axle - so that only the bottom 15mm or so actually show below the rail in which they sit. These now run smoothly on their steel flat bar rail. I have 8 a side.
Peter
|