Fitting a different sized scooter wheel, need bright ideas

[Gazdaman]

So anyway, I bought a Yamaha Aerox 50cc. It has a 13" rear wheel, which makes rear tyre choice almost nil for nobbly tyres.

It's a 3 stud rear wheel, so I bought a Peugeot Speedfight rear wheel, which is also 3 stud, and 12". Fantastic I thought!

Of course the PCD was wrong. So I bought the disc and hub assembly from a speedfight, which should fit over the splines of the final drive on the 'ped.
Here's the kicker, different sized splines.

Now I've looked at the various parts in the final drive and they look completely different. So does anyone have any bright ideas? I've thought about chopping up the two splined shafts and welding the Speedfight one on the end of the Aerox one. But then I'll have an issue that the new end will be bigger than the hole in the crank case, so it'll never be removable. And of course welding it perfectly straight and true will be almost impossible.

The other possibility is fabricating some sort of adapter plate to adapt the PCD, but will obviously space the wheel out slightly.

Sigh.

Gaz

[G]

Get your welder out and add the swing arm of your pit bike on to back of the main swing arm?
You can then add an auxiliary sprocket and chain drive to the current setup.

Anything to assit the competition in a sportsmanly fashion!

You'll also have the added benefit of reduced wheelies and better stability!


Err, more seriously... could you you not weld or otherwise attach some new studs to the original hub?

[Pedd]

can you not just re-drill the aerox hub new add studs??


edit: G posted same but quicker doh
____________________
Dont Click HERE
Current modes of transport = 125 superdream (in bits atm), 1978 GS750 chop, bandit 600(main one), 1982 bmw r100rs,
cx500 trike (hey its fun) oh and the car to ferry the missus and dogs around

[Jamie S]

What the hell are you going to be doing with an aerox that means it needs nobbly tyres ....

[G]

Probably this - https://geesvids.blip.tv/file/3661917/

To be honest, knobbly tyres aren't entirely essential - unless it rains, apparently!

[nsr_J22_FOXEYE]

[G]

[Gazdaman]

I would be tempted to drill/tap new studs, the only issue is that the PCD of the two wheels is very similar, and the design means it's not solid the whole way round.

I'm thinking I wonder how hard it'd be to make a splined 'washer'. So the inside of the washer fits over the smaller shaft, and the outside of the washer is splined to fit the inside of the bigger hub thing.

I guess it probably wouldn't be cheap to get machined though.

Only other thing is I get a disk machined up that's a 10mm spacer. With bolts of the original PCD, and also drilled for the other PCD.

But as said above, the trouble is it'll push the wheel out by 10mm.

[cb1rocket]

is the offset of both wheels the same then? You might find that with a spacer your get away without the wheel being off center? perhaps...

[G]

Judging by your performance last time, you'll crash in the practice and 'adjust' half the modifications anyway .

Not sure if overall I'd worry that much about it being 10mm out - suspect it's an issue for tarmac more, more as we've seen, running knobblies at the limit of grip on tarmac isn't really ideal anyway .

[Digitalize]

Sell the Aerox and buy a Speedfight?

Of course, that would be too easy
____________________
1998 CB600F Hornet

[Gazdaman]

The thought has crossed my mind, this ped only cost me £60. And everything else on it appears good.

Plus the entire front end is being replaced, so whatever bike it is, it won't end up looking like whatever it started off as.

I suspect I'll end up getting a PCD adapter plate made up.

Gaz

[G]

[Gazdaman]

I doubt I could sell the Aerox for much at the moment since it's in a squillion pieces spread all over my garage.

Once this rear wheel issue is worked out, and once I've fitted an awesome front end it'll be a quality 'ped.

I think I might keep my eyes out for a spares or repair Speedfight to bastardise for parts.

Now if anyone knows someone who could fabricate me a PCD adapter for cheapness, I would be mucho appreciative!

Gaz

[GREENI3]

That aerox must have been messed up quite badly for 60 quid

[Gazdaman]

It was pretty good actually! 10k miles. 1998 reg. Bit crusty in places, no MOT or tax, coolant leak, fork seals completely shagged.

https://www.gaz-racing.co.uk/images/vehicle_1275.JPG

It now looks like this:
https://www.gaz-racing.co.uk/images/vehicle_1308.JPG
plus a set of shelves full of parts.

Gaz

[GREENI3]

What condition is that frame in?

So what exactly are you planning on doing with it?

[Gazdaman]

Frame's nigh on perfect. I just intend on cutting off any unused brackets, bracing up the 'step through' part for a bit of added strength (read unnecessary tart factor).

It's going to be used for Moped Mayhem events this year, hopefully.

Gaz

[GREENI3]

So how can you take part in one of these events?

Seems like a bloody laugh after watching that video.

[Gazdaman]

I forget, G sorted it for me last year.

https://www.extremetrifle.com/2/mopedmayhem2_faqs.php

This link has been useful in the past, and even better it has a photo of both G and Bendy at Lydden on the front page.

£60, suitable bike. 6 hours of utter hell, but it's absolutely fantastic fun. After about 3 hours you wonder what the hell you've let yourself in for.

There's a bit of an article about the prep of my ped here:
https://www.gaz-racing.co.uk/content.php?page=viewarticle.php&article_id=148

Gaz

[GREENI3]

Cheers Gaz, might look into it.

[cb1rocket]

PCD = Pitch Circle Diameter

And the adapter is to modify the PCD

[cb1rocket]

an example

https://cgi.ebay.co.uk/PCD-Wheel-Adaptors-5x100-5x112-VW-Merc-Golf-A3-Leon-/150557072605?pt=LH_DefaultDomain_3&hash=item230de69cdd

yes i know its car specific

[cb1rocket]

could help with a cad drawing to send to the laser cutters if needs be.

[binge]

If the PCD is so similar, cant you drill the bolt holes slightly bigger in the speedfight wheel?

Failing that, as has already been said, check to see if the offset is the same on the wheels.

If it is then get a PCD plate made up. If it's 10mm thick, just get 10mm skimmed off of the speedfight wheel. Simple.