Tubular Tyres

[shirley_hkg]

Pretty common here.

[shirley_hkg]

Low profile 2.75-8 too.

[Burgerman]

But even so, why?
Bigger width, lower profile like the 120/70 I use are much better. Ride, longevity, cross section, lower pessure, less likely to puncture as less ground pressure, and you need a tubeless rim/adapter anyway. So fit slightly wider while you are doing it.

[Burgerman]

Heres my rims on aliexpress
And some thinner ones.

https://www.aliexpress.com/item/1005004749545473.html
But you can fit smaller tyres and thinner tyres instead if you want. On your stock skinny rims. But not tubeleess.

[Raro]

There are situations where a couple of centimeters means being able to access a space or not, anyway, as I told you, it is just an idea, I am not looking to put it into practice. Shirley, whatever they don't have in your country, don't look for it anywhere else.

[Burgerman]

They have tubeless 3.00 x 8 tyres because in chinese continent there are about 10 thousand scooters per mile. Often with whole families on board and the dog/sheep.

[Burgerman]

youtu.be/V8paX22Sgzg



youtu.be/_Np7pkoI9h8

[Raro]

It has to be overwhelming. I live in a very sparsely populated area and when I go to a city or am among a lot of people and there is a lot of noise, I feel disoriented.

[Burgerman]

I personally think it looks like great fun! But not for everyone. Unless you are used to it.

[jefferso]

There are situations where a couple of centimeters means being able to access a space or not

That's my situation. My Permobil F5 is just slightly wider than the Permobil C500. Right now, the armrests are the widest point on the chair, by about 3cm on each side. But there are times I'm going through a corridor or something where the armrest is touching the wall or part of the door and the tyre is scraping some moulding at floor level so I don't think I would want a wider tyre despite the other advantages. I don't think there's much room, if any, where the inner edge of the drive wheels is, so a wider tyre means less clearance down below. I'd like to get narrower armrests which I think would decrease the overall width of the F5 to be the same as the C500.

I definitely wouldn't want a taller tyre as my knees often scrape the bottom of a table at restaurants or offices and there are already plenty I can't get under.

I've been lucky (and careful avoiding debris and broken glass in the road or pavement) so far with the pneumatic tubed tyres (no punctures), but tubeless sounds so much more reliable so I'd like to change.

[Burgerman]

You can likely adjust the arms in by an inch to do what you need.

Sounds to me though that you really need a bit of house remodelling. When I landed in a chair I had a builder in, all walls are brick here. All doorways widened, doors that swing both ways (no not like that!) fitted to my room as I am in/out 30 times a day.

All ramps etc blended and invisible, so nothing looks adapted just easy and open for everyone.

Nerrowest door is about 800mm now. Most wider. In places where posible I extended rooms, removed walls and made everything much more open with bigger spaces. House looked like a building site for a few weeks. 26 years ago. The advantages far outweigh the pain and cost. Being disabled is bad enough without worrying about space, doorways and getting lined up etc.

[jefferso]

My flat is good. It was designed to be accessible. Wide corridors and doors, no problem moving around inside. I'm just occasionally limited when going out to pubs, restaurants, shops etc. I went to a restaurant not too long ago where the door didn't open all the way because it hit the counter, had a handle that stuck out and a weird hinge sticking out at the bottom. I had to get someone to lift the armrest, the tyre was scraping on the door hinge and it almost pulled out my ventilator hose as I passed through. With tyres a few centimetres wider I don't think I would have fit. It's bad design and accessibility on their part, but I want to maximise my chances.

Some older trains are weird too with odd shapes protruding and having to do really tight 90° turns into narrow doorways.

The PSVAR reference wheelchair is 700mm wide x 1200mm so it's good to fit in those dimensions if possible and the F5 just fits now (though I'm too tall with my head at around 1500mm)

[Burgerman]

700mm is 27.6 inches.

At that rate even an X5 or V6 and most of my own chairs will fit.

But if you really want narrower you can get narrower arms, mount the controller correcctly more inboard of the arm centreline, and fit smaller skinnier tyres on your stock rims.

2.5 wide and 12 diameter tyres are available in solid or tubed.
Thats 2 inches smaller diameter so rides 1 inch lower. And 1 inch narrower chair overall.

[Raro]

Jefferso has the same problems as me and many wheelchair users or people with reduced mobility. It is essential that our homes are accessible, the problem is that the rest of the world usually is not. The size of the wheelchairs should be more careful. I have always complained about the height. I also have an F5 and with it I cannot fit under any table, the same for the width when passing through any narrow door. I use a Chinese folding chair daily that does not have electrical functions but has very compact measurements with a width of 60 centimeters and a seat height from the floor of just under 40. I am not very tall with it, there are few places where I cannot access but Of course it has other shortcomings and is not for everyone. The problem with trying to narrow the armrests of the f5 that are too wide is that they generally do not allow the backrest to fit. The only way is usually to change them for narrower ones or see if your body allows a narrower backrest.

[jefferso]

Would these 2.75-8 rims work with these 3.00-8 tyres?

I'd like to duplicate the width and height I have now with Permobil's 3.00-8 14 inch tubed tyres but with tubeless.

If I were to proceed, I'd have to get an adapter for the 3 hole wheel hubs. Would there be a way to make sure the wheel didn't get any closer to the chair (to scrape against chair) or further out from the chair (to increase width of chair) ?

Or will the adapter always add some thickness and push the tyres out a bit?

[Burgerman]

Would these 2.75-8 rims work with these 3.00-8 tyres?

the RIM has 2.75 inches between its edges (the J part of 2.75J). Each rim edge is 1/4 inch. Now we have a total RIM width of 3.25 inches. With a tyre of less at 3.00 inches.
The perfect rim for that tyre size is 1.75 (as permobil use) 2 best to 2.5 inch absolute max. Will it FIT on a 2.75 rim? Yes. Depending on brand it will and will measure a little wider than its 3.00 inches. But the rim will look very wide compared to the tyre. It will stretch the tyre.

I'd like to duplicate the width and height I have now with Permobil's 3.00-8 14 inch tubed tyres but with tubeless.

Best bet would be a 2 1/4 wide rim. Or 2.5.

If I were to proceed, I'd have to get an adapter for the 3 hole wheel hubs. Would there be a way to make sure the wheel didn't get any closer to the chair (to scrape against chair) or further out from the chair (to increase width of chair) ?

Yes. You measure carefully! I always may sure theres a 3mm gap.

Or will the adapter always add some thickness and push the tyres out a bit?

That depends on the rim design, many are not symetrical, and width of rim and tyre. And on the original motor hub, and original wheel design. You just have to get a wheel with tyre fitted. Offer it up, measure carefully. Then make an adapter.

[jefferso]

Maybe I don't know how to search for rims but I often end up getting bicycle rims when searching for tubeless rims.

Would something like this work?

https://www.ebay.co.uk/itm/356161405034

83016000 TUBELESS RIM 2.15-8 MATTE PIAGGIO 125 FOR VESPA V1 V15 1948-1950

For vintage Vespas. Not cheap at £86.96, but maybe part of that is shipping from Italy.

[Burgerman]

It would work for the tyre but very hard to make an adapter to fit that rim.

[shirley_hkg]

Can make it if the dimensions of its adaptor is available.

Have a M3 here, but not sure the offsets are identical.

[Raro]

I have a Vespa tube rim like that but it seems to me that it is a bit wide for which you want it. I also tell you that they usually use specific nuts.

[Raro]

They use these, at least the original ones, I suppose the ones without a camera also use them. although maybe with a thicker screw you wouldn't have a problem.

[Burgerman]

Only needed as the threaded stud is too short.
Any nut or threaded bolt can be used presumably.

[jefferso]

Can make it if the dimensions of its adaptor is available.

Have a M3 here, but not sure the offsets are identical.

This makes it look like M3 and F5 Permobil wheels are the same.

https://mobilityequipmentforless.com/pr ... inch-solid

Photo looks the same and description says:

Permobil / Wheels
Aggressive Tread Drive Wheel Assembly for Permobil F3, F5, M3 Power Chairs
14 x 3 inch Solid/Flat-Free Wheels