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Table 4 Maximum bump height that the wheelchair rolled over for different caster diameters and speeds

From: Manual wheelchair downhill stability: an analysis of factors affecting tip probability

Speed Caster diameter
4 in 5 in 6 in
1 km/h 1.2 cm 1.5 cm 1.7 cm
3 km/h 1.7 cm 1.9 cm 2.2 cm
5 km/h 2.1 cm 2.4 cm 2.7 cm