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Author Topic: Pit Bike Wheels &tyres  (Read 300 times)

Scotty

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Pit Bike Wheels &tyres
« on: 19 March 2021, 05:57:19 pm »
Having settled on my “first build” ( Maserati 8CM or Peugeot Quadrilette) I have started my quest for “the bits” and am starting with the wheels.
In the past there has been talk about 17” Pit Bike Wheels from WKX Racing as they appear to come with the best option of 35mm O/D bearings. As I have a friend who lives in Belgium who could get them for me, the question(s) are;
1) should they be a good option
2) should I buy the tyres at the same time or,
3) are tyres freely available in the U.K. (thinking of shipping costs)
Any and all advice on this and any other aspect of a build would be appreciated so feel free to put me on the right track.

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StefanN

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Re: Pit Bike Wheels &tyres
« Reply #1 on: 20 March 2021, 07:03:57 am »
My Bugatti uses pitbike wheels and I’m pleased with them.   Get ones with a steel rim rather than alloy, and check the hub is the standard design.  Have a read of the build journal or Marek’s Delage build videos for details of bearings and bushes.

To my eye, pitbike knobbly tyres don’t look right and alternatives are easily available.   Andy Boulton was/is selling some 2.5” tyres very cheaply.

Graham has developed a steel adaptor disc (available for just a few £ from Gemini) that goes between a pitbike wheel and a 3 stud go-kart hub which is perfect for the rear axle.

RhysN

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Re: Pit Bike Wheels &tyres
« Reply #2 on: 20 March 2021, 09:38:54 am »
Just to clarify Stefan's mention of "standard hub". There are 2 standards. One has 37 mm OD bearings, the other has 35 mm. For bearing interchangeability the better is the 35 mm. These are commonly known as SDG, but I suggest before purchase asking for either the bearing number or the size. It's likely that 6202 bearings are fitted to the wheels you want. If it's 98202 they are the ones you do NOT want (they are 37 mm)
Yes to steel rims I agree totally.

Chris Brown

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Re: Pit Bike Wheels &tyres
« Reply #3 on: 20 March 2021, 11:36:21 am »
Just to save you hunting for it I've attached my bearing tabulation (again!).

Scotty

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Re: Pit Bike Wheels &tyres
« Reply #4 on: 21 March 2021, 10:38:17 pm »
First off my apologies for the delay to my reply but in my defence, being new to all this and having absolutely no engineering knowledge, there is a lot to absorb and assimilate so please make allowances for me.
I take on board about the wheels and the need to identify the inside size of the bearings so do I assume the standard stub axle diameter is 15mm?

Regards (Scotty)

StefanN

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Re: Pit Bike Wheels &tyres
« Reply #5 on: 22 March 2021, 12:18:30 am »
The pit bike wheels are likely to come with a 15mm Internal Diameter bearing.  The Gemini stub axle for these wheels is 17mm, so you’ll swap the front wheel bearings to 17mm ID bearings.

If you go for a 25mm axle at the rear, then you might need to clean up a bit of the middle of the casting for the axle to fit through.  Flanged Oilite bearings then push in nicely to support  the wheel on the axle.  (2 each wheel - Bearing Boys OBF253516)

Scotty

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Re: Pit Bike Wheels &tyres
« Reply #6 on: 22 March 2021, 09:12:18 am »
Stefan, thank you very much for the explanation, that cleared a lot up for me. You see what this goes to prove is, “us savages North of the Border” need to be taken by the hand every step of the way as we can’t be trusted to do things on our own 😂😂

By the by found C90 wheels on eBay so will check with them the O/D size of the bearing, I like buying from Scottish suppliers but if not English will have to do😏

Regards

Scotty

Graham Hill

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Re: Pit Bike Wheels &tyres
« Reply #7 on: 22 March 2021, 09:45:21 am »
Hopefully as a bit of help, here are the links to both front and rear axle solutions using Gemini components.

http://www.cyclekartsgb.com/tech-forum/turnkey-dropped-front-axle/

http://www.cyclekartsgb.com/tech-forum/pitbike-wheel-to-rear-axle-are-you-receiving-me/

The prices may now vary a little.
« Last Edit: 22 March 2021, 09:48:14 am by Graham Hill »

Scotty

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Re: Pit Bike Wheels &tyres
« Reply #8 on: 22 March 2021, 11:20:57 am »
Graham, thank you very much for your help and advice on this, will take it onboard and work from there.

Regards

Scotty