13x5 rims for Bounder

[emilevirus]

I'm looking for rims for my Bounder. PCD is 4x90mm, bore is 50mm.
I found one that'd fit but not enough width (I want 4.5"): https://www.aliexpress.com/item/1005004375059401.html
Any idea where I'd find one?

[Burgerman]

No.

But buy those rims.

Then get an online laser company to make you some flat spacers.
How wide do you want to go?
Get some 6 inch flat plate alloy disks cut, with 4 bolt holes and a 50mm centre hole...
If they cant cut these thick enough just get 4 or 6 cut. They go in the centre of those rims.

But heres your problem. You really want TUBELESS tyres and rims.
So look at tubeless aircraft rims. Like the Hegar ones I used for e.g with a alloy centre plate that has rubber sealing O rings and tubeless halfs. Those are available in many widths.

These rims are 5 inches wide for e.g.
And 6 inch wide TUBELESS puncture resistant kevlar reinforced K shield tyres...

Below rims came from here:
https://www.aircraftspruce.com/menus/lg ... ekits.html
They have all sorts.

[emilevirus]

Bounder themselves sell 13x4 rims with 1" or 2" plastic spacer. I wonder if I could just 3D print it. Would it be dangerous you think?

[Burgerman]

No. But the rims will need tubes... So punctures or deflations are probable at some point.

[emilevirus]

I know I've been using tubes for my entire life. I get punctures once a year or so. Those are $20. If tubeless rims are much more expensive is it really worth it?

[Burgerman]

Since I cant get out, walk, I would be stranded. So absolutely! No punctures since tubeless in 99.

Also £20 x 26 years is rather a lot!!!

My tubeless rims were £6 each aliexpress. Today they are 18 to 35 depending on seller. https://www.aliexpress.com/item/1005006907474879.html

[emilevirus]

Shirley is checking if it's possible make an adapter for common ones found on Aliexpress.

[Burgerman]

Its always possible.
I fitted non stock rims to every chair I ever had. Always quite easy really. You can make adapters by ordering blank laser cut disks and drilling/countersinking a few holes for e.g.
Heres some shirley hubs, for the rear drive Dietz chairs.

Heres some I made for the salsa. BM2, BM3, other chairs and rims...
by ordering disks and drilling/tapping on my bed... Or whatever.

[Burgerman]

Many ways! All that matters is determination! And action.

[emilevirus]

Yeah... At that price it'd be dumb not to do it. Specifically when 21st wants $500 for a pair of rims ONLY, tires are $300. Someone paying $300 for tires while it can be had on Amazon for $20 is just dumb!

[Burgerman]

All you need to do is choose a good tyre. 13 inch is too small. 14 or 15 has much better options. 120/70-8 is about the same diameter as a stock 14 inch tyre. Remember a tyre 1 inch bigger only lifts a chair 1/2 of that. And thats not even noticible. Then choose a rim. Doesent have to be 6 inch. Can be 8, or 10 or 12... Bigger tyres can be lower profile.

If it is, an issue adjust suspension. Its all just mind over metal.

[shirley_hkg]

Here are the measures from volgger Totally Normal.

The depth from top to mounting face is 1-7/8" need to be addressed.

Need rims have offset around 60mm in order to accommodate a transfer plate added.

[shirley_hkg]

One more thing to note. Spoket cover is sticking out, that limits the diameter of tyre.

[shirley_hkg]

And wonder the sizes of these bolts too, 5/16" or M8.

[shirley_hkg]

I found this rims seems feasible.

3 mounting holes @78mm eye to eye.
Centre hole 54mm.
145/70-6 tyre will measure 34cm big and 14cm wide, inflated @28psi.

Please advise and all inputs are welcome.

[Burgerman]

Rims are measured in inches. diameters are full inches and refer to the "hole" in the tyre across the bead.
Rim width is measured in J meaning the gap the tyre beads sit inside so a 4.5J rim is probably about 5 inches wide overall due to the thickness of the metal where the tyres sit.


145 all terrain tyres should be about 8 psi?
What is the actual rim diameter in inches? Is it intended for 6 inch tyres? J Width? You need:

Width
4.5 inches for 145/70 - 6 tyres (about 14 inch or a fraction less)
5 inches for 15-6.00 - 6 tyres like the kenda reinforced ones or turf tyres.
3.5 to 4 inches for 120/70-8 tyres.

[Burgerman]

The problem with 145/70-6 ATV type tyres is that they feel "bobbly" as you roll. Which you learn to ignore.

But they last me around 1 month rolling in summer on hard surfaces like roads and footpaths. After 3 weeks they look like smooth lumpy balloons!

Thats why I swapped to the Kenda turf tyres that seem to last forever. At least a few years.

These last a month.
Feel lumpy!
Look great...
145/70-6 all terrain.

[Burgerman]

These can fit the same rim.
Last forever.

And are puncture proof.

These are

LEFT Kenda K500 K Shield 15 x 6.00 - 6 tubeless.
RIGHT any old 145/70 all terrain tubeless tyres...

[shirley_hkg]

Yes. That tyre looks awesome.
Have to take it to a bike shop to mount it. One cannot do it by himself, can he ?

I am asked to find suitable rims, and make a transfer plate when necessary.

User picks the tyre himself.

[Burgerman]

Yes. I take them to the motorcycle shop 2 streets away. Takes them 10 mins.

You CAN do it yourself, on the 8 inch rims but its not easy. Unless 6 inch Hegar tubeless split rims. Which you can easily assemble yourself.

[emilevirus]

So Shirley, would it be easier for you to find 8" rims?

[Burgerman]

https://www.wheelchairdriver.com/board/ ... 87#p214036

[shirley_hkg]

So Shirley, would it be easier for you to find 8" rims?

You need a depth of 60mm from top to mounting surface (including transfer plate 8mm--10mm thick), or you will have to extend the track width.

Burgerman did me a favour to measure a 3.5J rims, which is 40mm only. So we are 20mm short, each side. 4.5J could be more than 40mm, but I am not sure.

Asked a dozen sellers about it, but no one answered.

May have to spend CAD $30 to find out ourself.

[emilevirus]

Okay let me know. I'll send you the money.

[shirley_hkg]

The whole hub looks.

[shirley_hkg]

Good news. A seller replied the depth of 4.5J is
50mm, very close to that of the original Bounder one.

It seems no transfer disc will be needed. Just need another set of holes, which match the stock ones, 4*∅5/16 THRU P.C.D. ∅3.5"
However, rims centre hole is 75mm. New holes are very close to edge.

If a 10mm transfer disc were deployed, track width would be another 20mm added up.

[shirley_hkg]

Really need advice of you guys expertise.

[LROBBINS]

How about a simple e.g. 10 mm thick disk on the OUTSIDE of the wheel with a 50mm center hole and holes matching the chair's bolt spacing drilled both through that plate and through the wheel. That would spread the bolt forces and protect the wheel from failure at the holes near the 75mm cutout.

[shirley_hkg]

Brilliant. A disk on the outside.

Flat head bolts to secure the outer disk and wheel first.
Another set of holes on the disk 4 ∅5/16 THRU PCD ∅2.75" to match the drive hub.

Centre hole matches the hub to share load too.

[Burgerman]

I would replace that chain with a better quality EK or RK branded O Ring motocycle one.

Let me tell you a story.
Big superbike. 90s. Needed tyres so while at it thought I would fit a new set of sprockets and a chain.

Chain choice.
Stock RK O ring chain, about £130 with sprockets.
Heavy Duty NON O ring chain (as used in industrial applications and poor ££ bikers) same sprockets as above. £75...

I ordered the cheaper HD non Oring chain. In 1 WEEK it was destroyed. Had to adjust tension daily! It just kept getting looser...
The O Ring chain I removed had lasted me 2 full years of quite serious abuse. Drag racing, wheelies, 170mph stuff. I was only changing it because it was a little corroded and lookd bad. It had never needed any tension adjustment in all that time and had outlived 4 or 5 tyres.

O-ring chains just LAST. Probably 7 to 10x longer. Only downside is that the O rings that seal in the grease also make it stiffer. So you waste some energy (range). With lithium and a sensible sized pack its not an issue. Non O ring chains are dismal by comparison.

Modern motorcycles just wouldnt be possible ithout O Ring chains.