Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

looking for a wheel with a 72" circumference

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

looking for a wheel with a 72" circumference

Old 11-11-18, 08:00 AM
  #1  
Nowicki
Junior Member
Thread Starter
 
Join Date: Nov 2018
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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.
Nowicki is offline  
Old 11-11-18, 08:26 AM
  #2  
cb400bill
Administrator
 
cb400bill's Avatar
 
Join Date: Jul 2007
Location: Kalamazoo MI
Posts: 16,441

Bikes: Fuji SL 2.1 (carbon fiber), Pinarello Stelvio (steel), Cannondale Synapse (aluminum)

Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 1249 Post(s)
Liked 39 Times in 28 Posts
What type of bike are you working with?
cb400bill is offline  
Old 11-11-18, 08:45 AM
  #3  
rosefarts
Senior Member
 
Join Date: May 2015
Posts: 654
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 266 Post(s)
Likes: 0
Liked 43 Times in 15 Posts
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?
rosefarts is offline  
Old 11-11-18, 08:50 AM
  #4  
Cougrrcj 
Over forty victim of Fate
 
Cougrrcj's Avatar
 
Join Date: Jul 2011
Location: NE Ohio
Posts: 3,005

Bikes: A few...

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 295 Post(s)
Liked 3 Times in 3 Posts
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"
__________________
'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Huffy MTB - for trips to corner store
MTB of questionable lineage aka 'Mutt Trail Bike'
Cougrrcj is offline  
Old 11-11-18, 08:58 AM
  #5  
Kedosto
Ambulophobic
 
Join Date: Nov 2008
Location: San Leandro, CA
Posts: 1,117
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 402 Post(s)
Liked 83 Times in 55 Posts
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.
Kedosto is offline  
Old 11-11-18, 10:21 AM
  #6  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 21,346

Bikes: Some silver ones, a red one, an orange one and a few titanium ones

Mentioned: 92 Post(s)
Tagged: 1 Thread(s)
Quoted: 2463 Post(s)
Likes: 0
Liked 102 Times in 69 Posts
Originally Posted by Cougrrcj View Post
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.
__________________
Stuart Black
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.
cyccommute is offline  
Old 11-11-18, 07:12 PM
  #7  
Nowicki
Junior Member
Thread Starter
 
Join Date: Nov 2018
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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.
Nowicki is offline  
Old 11-11-18, 08:40 PM
  #8  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 5,029

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 666 Post(s)
Liked 47 Times in 40 Posts
Originally Posted by Nowicki View Post
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
dedhed is offline  
Old 11-11-18, 08:47 PM
  #9  
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Posts: 10,950

Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 910 Post(s)
Liked 25 Times in 20 Posts
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.
BlazingPedals is offline  
Old 11-11-18, 10:24 PM
  #10  
rollagain
Lopsided biped
 
rollagain's Avatar
 
Join Date: Nov 2017
Location: NE Ohio
Posts: 442

Bikes: 2017 Day 6 Cyclone (the Buick); 2015 Simcoe Deluxe (the Xebec); Street Strider 3i (the not-a-bike)

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 182 Post(s)
Liked 2 Times in 2 Posts
Originally Posted by Nowicki View Post
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.
rollagain is offline  
Old 11-12-18, 12:35 AM
  #11  
Nowicki
Junior Member
Thread Starter
 
Join Date: Nov 2018
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by rollagain View Post
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.
Nowicki is offline  
Old 11-12-18, 12:38 AM
  #12  
Nowicki
Junior Member
Thread Starter
 
Join Date: Nov 2018
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by dedhed View Post
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.
Nowicki is offline  
Old 11-12-18, 01:23 PM
  #13  
rollagain
Lopsided biped
 
rollagain's Avatar
 
Join Date: Nov 2017
Location: NE Ohio
Posts: 442

Bikes: 2017 Day 6 Cyclone (the Buick); 2015 Simcoe Deluxe (the Xebec); Street Strider 3i (the not-a-bike)

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 182 Post(s)
Liked 2 Times in 2 Posts
Originally Posted by Nowicki View Post
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?
rollagain is offline  
Old 11-12-18, 01:26 PM
  #14  
indyfabz
Senior Member
 
Join Date: Jan 2010
Posts: 22,468
Mentioned: 163 Post(s)
Tagged: 1 Thread(s)
Quoted: 8602 Post(s)
Liked 341 Times in 218 Posts
I thought you said there wasn't going to be any math involved!
indyfabz is offline  
Old 11-12-18, 01:34 PM
  #15  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 7,947
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 813 Post(s)
Likes: 0
Liked 1 Time in 1 Post
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.
dabac is offline  
Old 11-12-18, 02:00 PM
  #16  
Nowicki
Junior Member
Thread Starter
 
Join Date: Nov 2018
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by rollagain View Post
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
Nowicki is offline  
Old 11-12-18, 07:07 PM
  #17  
rollagain
Lopsided biped
 
rollagain's Avatar
 
Join Date: Nov 2017
Location: NE Ohio
Posts: 442

Bikes: 2017 Day 6 Cyclone (the Buick); 2015 Simcoe Deluxe (the Xebec); Street Strider 3i (the not-a-bike)

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 182 Post(s)
Liked 2 Times in 2 Posts
Originally Posted by Nowicki View Post
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.
rollagain is offline  
Old 11-12-18, 10:40 PM
  #18  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 22,486
Mentioned: 166 Post(s)
Tagged: 0 Thread(s)
Quoted: 8517 Post(s)
Liked 73 Times in 65 Posts
Originally Posted by dabac View Post
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.
CliffordK is offline  
Old 11-12-18, 10:47 PM
  #19  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 22,486
Mentioned: 166 Post(s)
Tagged: 0 Thread(s)
Quoted: 8517 Post(s)
Liked 73 Times in 65 Posts
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.
CliffordK is offline  
Old 11-12-18, 11:31 PM
  #20  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 7,947
Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 813 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by CliffordK View Post
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?
dabac is offline  
Old 11-13-18, 01:11 AM
  #21  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 22,486
Mentioned: 166 Post(s)
Tagged: 0 Thread(s)
Quoted: 8517 Post(s)
Liked 73 Times in 65 Posts
Originally Posted by dabac View Post

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.
CliffordK is offline  
Old 11-13-18, 06:47 AM
  #22  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 5,029

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 666 Post(s)
Liked 47 Times in 40 Posts
Flat profile muscle bike "slik". https://www.ebay.com/itm/BICYCLE-SLI...-/151050245111
dedhed is offline  
Old 11-13-18, 08:39 AM
  #23  
njkayaker
Senior Member
 
Join Date: Sep 2007
Posts: 11,083
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 1698 Post(s)
Liked 18 Times in 13 Posts
Originally Posted by Nowicki View Post
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?
njkayaker is offline  
Old 11-14-18, 08:53 PM
  #24  
Cougrrcj 
Over forty victim of Fate
 
Cougrrcj's Avatar
 
Join Date: Jul 2011
Location: NE Ohio
Posts: 3,005

Bikes: A few...

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 295 Post(s)
Liked 3 Times in 3 Posts
@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.
__________________
'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Huffy MTB - for trips to corner store
MTB of questionable lineage aka 'Mutt Trail Bike'
Cougrrcj is offline  
Old 11-15-18, 09:21 AM
  #25  
Nowicki
Junior Member
Thread Starter
 
Join Date: Nov 2018
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by njkayaker View Post
????

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
Nowicki is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.