Power Wheelchair Front Wheels: Front wheels are generally available as soft, solid tires, measuring 200x50 (20cm wheel diameter). Silicone-filled front wheels are generally preferred. The reason for choosing solid front wheels is that these wheels are the ones that take the most impact during driving. Some users prefer solid tires for both the front and rear wheels instead of inflatable tires. The most important reason for this is that solid tires are puncture-resistant. However, despite this feature, excessive vibration can be a problem for users. However, punctures with inflatable tires are easily repaired. The price shown is for a single unit.