Drag Racing Discussions > Front Engine Dragsters

front tires

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adrianphicks:
Not sure re. Avon tyres being out of production.  Here's a link to the Avon Speedmaster Mk II:

http://www.avon-tyres.co.uk/motorcycle/speedmaster-mkii

dreracecar:
Its the 2.25 - 17 that they dont/will not make anymore because of them being used on dragsters

KeithDyer:
Jon and Bruce are two of the sharpest guys around.

When they tell you something, you can take to the bank . . . . .

Dolmetsch:
ON one of our dragsters and it isn't a top fuel or anything but it does have 17 inch wires we get take offs from the local bike race track which is the same facility we often drag at. They are brand new that day but the sidewall sticky is worn away from cornering so they replace them everyday. They are speed rated. I think 200MPH. One racer  gave us one at the end of each day for free as they only have to dispose of them anyway. On a dragster running straight up instead of cornering on the sidewall they are good for a long long time. As to wear we build ackerman in so scrub wear from pit work and turning on and off the track becomes essentially non existent even though some would say ackerman going 200+ is non productive we figured out the front tire wear comes from loading and loading and roaming around pits , staging lanes and return roads and so we went back to using it in everything since it hurts nothing anyway going straight ahead. 
don

JrFuel Hayden:
Don, what size M/C racing tires is your friend getting, using ? Most 17" M/C front tires are 120/70, or 120/60x17, which are 4.6" wide, and should be mounted on 3.50 or 3.75" wide wheels. Big show [NHRA] TF tires are 3.4" wide, so 4.6" is BIG.  I think a 4.6" wide tire on a dragster will slow the dragster down, too much rolling resistance. But I guess Free is Free
Is your friend mounting the used M/C race tires on the most common 1.4" wide wire spoke rims ?  What does he do to get those 4 1/2" wide tires on 1.4" rims ? I have a real hard time getting any 17" front runners to fully bead-up on 1.4" wide rims, so it sounds like 4 1/2" tire would be impossible to bead up.
Plus the highest speed rated motorcycle tire I've seen is 174mph, that's sustained speed, not 1/4 mile. They speed rate test tires because at sustained speed tires get hot from flexing and if the tires are not designed to handle that much heat, they come apart.
I've seen some M/C manufacturing tire testing labs where I've seen parts of tires stuck in the ceiling. 

Good Hunting,
Jon

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