Hi Phil think that quality and lightness is very important . over the years when i still rode bikes i would have to replace a helmet every 2-3 years as the lining used to breakdown from sweat and wear and tear.
The things i noticed most was the weight of the helmets got lighter and normally found the same brand fitted best.
At one stage i only had a bike so i rode every day so like Don said comfort is very important .
The helmet i use for sprints is a bike helmet not a car helmet the only difference is the fire rating of the lining. the protection is the same from an impact point of view.
If i was going to go door to door racing i would invest in a new nomex lined car racing helmet and hans or simular device. The chances of a crash greatly increase when all the nuters are out together.
oz.
