From: Manual wheelchair downhill stability: an analysis of factors affecting tip probability
Speed
Caster diameter
4 in
5 in
6 in
1Â km/h
1.2Â cm
1.5Â cm
1.7Â cm
3Â km/h
1.9Â cm
2.2Â cm
5Â km/h
2.1Â cm
2.4Â cm
2.7Â cm