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# looking for a wheel with a 72" circumference

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# looking for a wheel with a 72" circumference

11-11-18, 08:00 AM
#1
Nowicki
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looking for a wheel with a 72" circumference

Looking for a wheel with a 72" circumference inflated.

Last edited by Nowicki; 11-11-18 at 08:08 AM.
11-11-18, 08:26 AM
#2
cb400bill

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What type of bike are you working with?
11-11-18, 08:45 AM
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rosefarts
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It's a little early to do calculations with pi for me this morning.

Wheels aren't measured in circumference.

What size is printed on the tire?
11-11-18, 08:50 AM
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Cougrrcj
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Cir = Pi x d (or 2 x Pi x r)

72" = 3.1415926 x d

72" / 3.1415926 = d

22.918 = d

So essentially you'll need a 20" rim and whatever tire makes the total diameter 22.918"
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11-11-18, 08:58 AM
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Kedosto
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According to the Cateye wheel circumference chart you’d need a tire between 24 x 1 ⅛ and 24 x 1 ¼. I’m not sure such an animal exists.

72” = 182.88 cm
24 x 1 ⅛ = 179
24 x 1 ¼ = 191
(22 x 1 ½ = 179)

EDIT: Oops. You mean wheel, or tire? I’m talking tire when you might mean wheel.

-Kedosto

Last edited by Kedosto; 11-11-18 at 09:07 AM.
11-11-18, 10:21 AM
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cyccommute
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Originally Posted by Cougrrcj
Cir = Pi x d (or 2 x Pi x r)

72" = 3.1415926 x d

72" / 3.1415926 = d

22.918 = d

So essentially you'll need a 20" rim and whatever tire makes the total diameter 22.918"
If by a “20” rim” you mean like a BMX wheel, you are on the right track but wrong size. Wheels are sized to the outside diameter of a generic tire. A mountain bike rim is 559mm or 22.0”. A 650B or 27.5er rim fits into the range as well at 587mm (22.9”= 582mm).

That’s for the rim. Considering that Nowicki said “inflated” I would suspect that includes the tire. A 26” mountain bike wheel with a narrow tire (and some error in measurement) would fit right into that 72” circumference.

Nowicki: check the side of the tire. It should be marked.
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11-11-18, 07:12 PM
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It's not for a bike. I am looking for a wheel I can mount a grinding belt on. The belt is 72". If I could find a wheel that is less than 72" and a little more when inflated it would be great. I would use it as a peddle powered grinder.
11-11-18, 08:40 PM
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dedhed
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Originally Posted by Nowicki
It's not for a bike. I am looking for a wheel I can mount a grinding belt on. The belt is 72". If I could find a wheel that is less than 72" and a little more when inflated it would be great. I would use it as a peddle powered grinder.
You can buy custom size sanding belts very easily. Find the wheel/tire you want and order the belts custom.

https://www.abrasivesupply.com/Articles.asp?ID=133

https://customsandingbelts.com/
Custom Sanding Belts | Econaway Abrasives
11-11-18, 08:47 PM
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BlazingPedals
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An ISO 540 wheel - basically a 24" wheelchair wheel, with a 1" tire, would be close at 72.9" calculated. A 507 wheel might also work. It's used mostly in juvenile mountain bikes and can take fatter tires.
11-11-18, 10:24 PM
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rollagain
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Originally Posted by Nowicki
It's not for a bike. I am looking for a wheel I can mount a grinding belt on. The belt is 72". If I could find a wheel that is less than 72" and a little more when inflated it would be great. I would use it as a peddle powered grinder.
I don't think that's going to work. I think that the first time you pressed a workpiece against that, it would snag your sanding belt and destroy it.
11-12-18, 12:35 AM
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Nowicki
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Originally Posted by rollagain
I don't think that's going to work. I think that the first time you pressed a workpiece against that, it would snag your sanding belt and destroy it.
As long as the blade edge is away from the direction of rotation it should be fine. Guess I'll find out. I'll use a worn belt first. Thanks for the warning.
11-12-18, 12:38 AM
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Nowicki
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Originally Posted by dedhed
You can buy custom size sanding belts very easily. Find the wheel/tire you want and order the belts custom.
Thanks. I'll check them out. Was looking for 72" because that is what I have.
11-12-18, 01:23 PM
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rollagain
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Originally Posted by Nowicki
As long as the blade edge is away from the direction of rotation it should be fine. Guess I'll find out. I'll use a worn belt first. Thanks for the warning.
That's the wrong way to grind blades; it creates a ragged burr-edge. Depending how much material you want to remove, you could be better off clamping the workpiece in a vice and just using hand-files on it. It's slower but you have a lot better control. For heavy work a bench grinder is good. What are you trying to make?
11-12-18, 01:26 PM
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indyfabz
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I thought you said there wasn't going to be any math involved!
11-12-18, 01:34 PM
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dabac
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Sanding belts are flat. Bicycle tires are rounded. Unless you find a very narrow belt, I believe you’ll find it very hard to use the full width of the belt.
11-12-18, 02:00 PM
#16
Nowicki
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Originally Posted by rollagain
That's the wrong way to grind blades; it creates a ragged burr-edge. Depending how much material you want to remove, you could be better off clamping the workpiece in a vice and just using hand-files on it. It's slower but you have a lot better control. For heavy work a bench grinder is good. What are you trying to make?
I'm doing a sushi blade which needs a large wheel hollow grind on one side and flat grind on the other. I'll forge to about 80 % then do the rough grind on my Bater III. The hollow will be on the 28ish" wheel. It is only sharpened from the flat side so the ragged edge will come off. Finish with wet stones
11-12-18, 07:07 PM
#17
rollagain
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Originally Posted by Nowicki
I'm doing a sushi blade which needs a large wheel hollow grind on one side and flat grind on the other. I'll forge to about 80 % then do the rough grind on my Bater III. The hollow will be on the 28ish" wheel. It is only sharpened from the flat side so the ragged edge will come off. Finish with wet stones
Wow. Hope that works out for you.

In the garage where I grew up there was a treadle-powered grindstone about that big. I think some bladesmiths still use them; I think they call it a water wheel because they're equipped with a can that leaks a little dribble of water onto it.
11-12-18, 10:40 PM
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CliffordK
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Originally Posted by dabac
Sanding belts are flat. Bicycle tires are rounded. Unless you find a very narrow belt, I believe you’ll find it very hard to use the full width of the belt.
Air is generally space filling, so if one had a slightly oversized tire, installed the belt, then blew up the tire, it might work.

Are there trike or trailer specific tires with a flatter profile?

Many wood sanding belts are mounted on a pneumatic drum. It gives a much softer finish than a hard drum.

I can't say if sponginess would be desirable for grinding steel. It might depend on what you're making, or the actual finishing step.

Heat, of course, could also be an issue.
11-12-18, 10:47 PM
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CliffordK
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If I was doing it, I'd look at using a hard rubber garden cart wheel.

https://www.northerntool.com/shop/to...-spoked-wheels

Perhaps even attempt to relace one onto a rear drive hub. Multi-gear? Fixie?

I'd probably choose an undersized wheel, for example a 16" wheel, and build the system with an idler tension pulley.

========

I still might consider a steel flat belt pulley rather than a bicycle wheel.

Last edited by CliffordK; 11-12-18 at 10:54 PM.
11-12-18, 11:31 PM
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dabac
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Originally Posted by CliffordK
Many wood sanding belts are mounted on a pneumatic drum. It gives a much softer finish than a hard drum.
But those ar far more like a tube mounted to a spindle than tires.
Maybe the OP should be searching for a one size smaller tube to fit his rim and try to fit the belt directly onto that?
11-13-18, 01:11 AM
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CliffordK
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Originally Posted by dabac

But those ar far more like a tube mounted to a spindle than tires.
Maybe the OP should be searching for a one size smaller tube to fit his rim and try to fit the belt directly onto that?
Thornproof tubes can be tough, and to a large extent can also hold their form.

Ok, so the diameter of the hoop is 22.918" = 582mm

A 26" MTB wheel will be 559mm BSD. Add about 11mm for the sidewall thickness, and one gets 570mm or about 12mm below the belt size.

So, a 26" thornproof tube on a 26" MTB rim (559BSD) might fit together quite well, and would be cheap, and give decent support for the belt. Of course the belt width would have to be close to the rim width. Say about 1 1/2" or so.

Hmmm One might have to experiment a bit. A 24" thornproof tube might be easier to mount on the 26" rim than the 26" thornproof tube.

Just be careful with the tubes and sharp knives.

Last edited by CliffordK; 11-13-18 at 01:27 AM.
11-13-18, 06:47 AM
#22
dedhed
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Flat profile muscle bike "slik". https://www.ebay.com/itm/BICYCLE-SLI...-/151050245111
11-13-18, 08:39 AM
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Originally Posted by Nowicki
It's not for a bike. I am looking for a wheel I can mount a grinding belt on. The belt is 72". If I could find a wheel that is less than 72" and a little more when inflated it would be great. I would use it as a peddle powered grinder.
????

Why didn't you say so in your first post?
11-14-18, 08:53 PM
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Cougrrcj
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@cyccommute -- FWIW, I went out and measured a 26" MTB rim - and it was 22.5" to the outside edge of the rim itself, and 25.5 with a 26x1.75 tire mounted. I don't have any 20- or 24" rims or 20- or 24"-tired bikes to measure..But my math is still correct to achieve a 22.918" diameter.
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11-15-18, 09:21 AM
#25
Nowicki
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Originally Posted by njkayaker
????

Why didn't you say so in your first post?
I was trying to figure out if it would work or not. My next question is... I am retiring soon. I plan to get a travel trailer. Would a mountain bike be good on roads as well as off road for a 2nd means of transportation when the trailer is parked somewhere? Not planning to get a toy hauler so I might need something smaller and if I can also grind with it that would be a good thing