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Tyre size problems

1087 Views 5 Replies 4 Participants Last post by  RichD
My GT40 is all but ready for its race debut at the Phoenix Open Day, But I'm having real issues with Tyres.

I have a Slot It rear axle and Sidewinder gear which is 19mm, I have SIP04 Wheels and was planning to use the SlotIt 20x11 tyres. However in doing so the Magnet is pulling the car down too much that the gear starts grinding on the track or the wheels just wheelspin in the air.

I then thought I would give the Original GT40 tyres a go so I altered the Inside of the tyres to fit the larger groove of the SlotIt wheel. These fit very well now. But the car is still getting stuck on the track in places.

Can anyone reccommend some tyres I could use with the SIP04 wheels of a larger diameter?I'm guessing 21mm ones may help. Alternatively should I just try to raise the magnet as at present I've recessed it into the Chassis.(Not flush with the underpan though)

Even with these major friction problems the car has annihalated my best laptimes on my 20 metre circuit in my loft without trying so I know it can get a fair bit quicker.

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I've just tried it with no magnet and am experiencing the exact same problem.

Are Slot It bearings different(In size) to Scalextric ones?
Cheers for the advice Jonny,

I can confirm mine is gonna go like stink as well. The way it is driving with a few teething problems I can feel once I iron them out it will fly.
I've raised the Magnet up so it can't bind onto the track.

Anyway,back to the problem. A friend came and had a look and I think we've solved the problem. We are gonna try a slightly larger Wheel hub which should arrive today(For his TVR)Then put the existing ones I have onto the front with some Skinny tyres.

I'll stick with the original GT40 tyres on the rear as I've ground them down and trued them very well and they did impress me the other night.

You'll be pleased to know that 3 of us will be coming in my party.Was gonna be 6 but the 2 boys dad is away working in Sweden and they aren't allowed to come with us "irresponsible" 25 year olds.
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