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#Post#: 2468--------------------------------------------------
Pit Bike Wheel to Rear Axle... are you receiving me?
By: Graham Hill Date: June 15, 2020, 6:23 am
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17” pit bike wheels are now commonly accepted as an alternative
to the increasingly elusive Honda C90 wheels. I am demonstrating
a simple method I have used here, for attaching to a standard
25mm kart rear axle to produce a fixed wheel solution.
Components:
2 off. Standard karting mono-alloy 3-stud rear hub. Typically
£17.00 each online. Plus key steel.
2 off. 3mm steel ‘CycleKart adaptor plate’, newly available from
Gemini Karts in their shop section. £2.80 each plus VAT
4 off. Flanged Oilite bushing OBF253516. Bearing Boys £3.88 each
plus VAT
14 off. M8 x 25 Stainless steel socket button set screws.
Toolstation Code 11982. £6.29 for a pack of 50.
2 off. Standard 25mm locking collar. Typically, £3.00 each
online
2 off. External circlip. Less than £1.00 each online
Method:
1.The three 8mm studs require removal from the kart mono hubs.
Mine unscrewed easily after carefully heating.
2.The standard 17” rim hub will require a couple of simple
alterations. Remove the existing 35x15 bearings from both sides
of the wheel by simply knocking out. The wheel hub has a raised
flange to the disc carrier which is best removed flush and this
can be achieved with an angle grinder, abrasive flap wheel or a
hand file. See photo. The inside diameter of the wheel hub will
most likely require a small amount of additional filing to
remove casting flashing and allow the 25mm axle to pass clear
through (this does not have to be accurate).
3. The Oilite flanged bushings are OD 35mm and ID 25mm and will
press fit snuggly into both the inside and outside face of the
wheel hub (in place of the original 35 x 15 bearings). These
bushings are used as reducing spacers only and do not rotate on
the axle.
4. The mono hub is fitted utilising the axle keyway. The 3mm
steel adaptor plate is now bolted to the mono hub using three
button head set screws, using thread-locker. Note, button head
type screws are the best fit here but will still clash slightly
with the wheel hub. This is remedied by cutting a small section
off the outside of each screw head. See photo. This does have
the advantage that they cannot back-out unseen.
5. Finish off by fixing four more set screws between the adaptor
plate and the wheel hub, (photo shows a standard bolt in this
instance) .Then a locking collar and a circlip.
NOTE. Each wheel has three separate attachments to the axle. The
locking mono hub, the external locking collar and the external
circlip. Individuals should ascertain for themselves the
security of this suggestion, however I have yet to experience
any issues.
See also my previous article on the tech forum utilising pitbike
wheels with a front axle. ‘Turnkey dropped front axle’ 14.08.19
#Post#: 2471--------------------------------------------------
Re: Pitbike Wheel to Rear Axle... are you receiving me?
By: chrisenamels Date: June 15, 2020, 8:50 am
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Thanks for setting that out Graham, the adaptor plate is
particularly handy, not worth making them at that price.
#Post#: 2473--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: jim Date: June 15, 2020, 12:19 pm
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That looks really good Graham and I will use that method myself
the next time I use pit bike wheels.
#Post#: 2474--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: Graham Hill Date: June 15, 2020, 1:06 pm
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Thanks, I did spend some time with Gemini Karts developing the
budget adaptor plate for general sale.
#Post#: 5959--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: guest274 Date: March 14, 2022, 5:53 am
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Whist following the procedure suggested by Graham Hill when
fitting hubs to pit bike wheels, which was very useful, I had to
amend slightly what I did. The 8x25 stainless steel screws used
to fit the adaptor plate to the hubs had to be shortened to
about 13mm to allow them to tighten. The 8mm studs that were in
came out easily using two locking nuts. I didn't grind down the
flange on the wheel hub. Instead I used 8mm washers flush with
the flange. Other than that, it went as described.
#Post#: 5960--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: RhysN Date: March 14, 2022, 5:57 am
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I do understand that at least you have taken some measure to
deal with the disparity of the surface, however, as I have
broken one of the lugs myself (of course it then became a front
wheel) it's a matter of very few minutes with a flap disc to
take the lip off, and the the disc has a full contact surface.
End of the day, it's your call. I now do it always, lesson
learned the hard way :)
#Post#: 5963--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: guest274 Date: March 14, 2022, 8:50 am
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Thanks for the info.
#Post#: 7532--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: Tinworm Date: August 31, 2022, 11:26 am
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[quote author=jim link=topic=337.msg2473#msg2473
date=1592241567]
That looks really good Graham and I will use that method myself
the next time I use pit bike wheels.
[/quote]
Jim, in your workshop you have a kart which you didn't build (I
think you said), which has retaining bolts at the ends of the
rear axle (tapped M12, I believe?). Have you tried Graham's
method now and if so, do you think that a circlip is just as
good?
I have been setting up my pillar drill to do an end hole, but if
the circlip works fine, I may not bother (except that it might
make it possible to have brass detailing later).
#Post#: 7533--------------------------------------------------
Re: Pit Bike Wheel to Rear Axle... are you receiving me?
By: Tinworm Date: August 31, 2022, 11:28 am
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[quote author=Graham Hill link=topic=337.msg2474#msg2474
date=1592244375]
Thanks, I did spend some time with Gemini Karts developing the
budget adaptor plate for general sale.
[/quote]
Graham, has a wheel ever come off using this method - especially
the circlip? Has anyone lost a wheel through the circlip
failing?
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