wheel diameter
#1
Senior Member
Thread Starter
Join Date: Jun 2009
Location: mpls, mn
Posts: 81
Bikes: raleigh peak
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
wheel diameter
my mtn bike has 26" tires . the tire size says 26x1.50" . the steel rim measures 22.5" in diameter. my old schwin collegiate has 26" tires and the tire says 26x1-3/8". but the rim is 24". would either tire fit on either rim?
#2
Cat 6
Join Date: Dec 2007
Location: Mountain Brook, AL
Posts: 7,482
Mentioned: 27 Post(s)
Tagged: 0 Thread(s)
Quoted: 500 Post(s)
Liked 184 Times
in
119 Posts
decimal 26" tires and fractional 26" are not compatible. Don't blame me. I didn't make the rules.
Consult Sheldon Brown.
Consult Sheldon Brown.
__________________
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
#3
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 644 Times
in
365 Posts
Nope.
You might think that 26" = 26" but that's not how it is with bicycles. The tire bead seat diameters are different so fractional tires and decimal tires won't interchange.
You might think that 26" = 26" but that's not how it is with bicycles. The tire bead seat diameters are different so fractional tires and decimal tires won't interchange.
#4
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2027 Post(s)
Likes: 0
Liked 1,099 Times
in
745 Posts
Bicycle tire and rim sizing terminology dates from the 1800's and there was no consistancy as to how the sizes were named.
Several years ago the European Tire and Rim Technical Organization (ETRTO) developed a consistant system that standardized the various sizes and gave them specific dimensions based on the rim's bead seat diameter in mm and tire width in mm. For example an MTB 26" wheel is defined as an ETRTO 559 and a 2.0" MTB tire for that rim is an ETRTO 559 x 50 mm. A 700c road rim is an ETRTO 622 and a 700x23 road tire is ETRTO 622x23. There are LOTS of others.
The International Standards Organization (ISO) adopted the ETRTO standards so you will now also see wheels designated by their ISO size.
Sheldon Brown's web site has the history of this standard and a table showing the various tire and rims and their ISO/ETRTO sizes.
Several years ago the European Tire and Rim Technical Organization (ETRTO) developed a consistant system that standardized the various sizes and gave them specific dimensions based on the rim's bead seat diameter in mm and tire width in mm. For example an MTB 26" wheel is defined as an ETRTO 559 and a 2.0" MTB tire for that rim is an ETRTO 559 x 50 mm. A 700c road rim is an ETRTO 622 and a 700x23 road tire is ETRTO 622x23. There are LOTS of others.
The International Standards Organization (ISO) adopted the ETRTO standards so you will now also see wheels designated by their ISO size.
Sheldon Brown's web site has the history of this standard and a table showing the various tire and rims and their ISO/ETRTO sizes.
#5
Banned
Join Date: May 2009
Posts: 2,078
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
Tire sizes should be thought of as names not measurements.
Most 26X1-3/8 wheels take a 590mm tire, also called 650A or EA3.
Schwinns marked 26X1-3/8 sometimes came with a wheel which needed 597mm tires. I think those were proprietary to Schwinn and are marked S-6 instead of EA3.
26" MTBs take a 559mm.
I think there are at least eight sizes called "26 by something".
Most 26X1-3/8 wheels take a 590mm tire, also called 650A or EA3.
Schwinns marked 26X1-3/8 sometimes came with a wheel which needed 597mm tires. I think those were proprietary to Schwinn and are marked S-6 instead of EA3.
26" MTBs take a 559mm.
I think there are at least eight sizes called "26 by something".
#6
Senior Member
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Posts: 12,257
Bikes: Bianchi, Miyata, Dahon, Rossin
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 5 Times
in
5 Posts
Tire sizes should be thought of as names not measurements.
Most 26X1-3/8 wheels take a 590mm tire, also called 650A or EA3.
Schwinns marked 26X1-3/8 sometimes came with a wheel which needed 597mm tires. I think those were proprietary to Schwinn and are marked S-6 instead of EA3.
26" MTBs take a 559mm.
I think there are at least eight sizes called "26 by something".
Most 26X1-3/8 wheels take a 590mm tire, also called 650A or EA3.
Schwinns marked 26X1-3/8 sometimes came with a wheel which needed 597mm tires. I think those were proprietary to Schwinn and are marked S-6 instead of EA3.
26" MTBs take a 559mm.
I think there are at least eight sizes called "26 by something".
700x23mm is really 26" in diameter, while a 559mm rim requires 26x2.2in tires to make it a real 26"
German tire manufacturer, Continental, still calls 700c tires they make "28in" and uses fractions instead of decimals and decimals instead of fractions for their tires. It's really odd since germany was one of the first countries to adopt metric.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
https://sanfrancisco.ibtimes.com/arti...ger-photos.htm
#7
Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,884
Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 821 Post(s)
Liked 771 Times
in
400 Posts
Consult Sheldon Brown.
Long ago and far away, I managed to pry a 26 x 1 3/8" EA3 tire onto a 26 x 1 3/8" S-6 rim. This so impressed the head mechanic at the local bike shop that they eventually hired me. Thus began my 12 year career in the bicycle business.
FWIW: an EA3 rim is about 7mm smaller in diameter than a S-6 rim. That tire I pried on? It had to be taken off with diagonal cutters.
__________________
Jeff Wills
Comcast nuked my web page. It will return soon..
Jeff Wills
Comcast nuked my web page. It will return soon..
#8
Senior Member
Thread Starter
Join Date: Jun 2009
Location: mpls, mn
Posts: 81
Bikes: raleigh peak
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
the rear tube blew on the schwinn. i replaced the tube and noticed text on the tire that mentioned S-6 rims i believe. the original tube was a schwinn labeled tube. might be original. man, that collegiate is a tank. wheels turn but require serious effort to move. can you get new lighter rims for this thing? or maybe just regrease/pack the wheels?
#9
Banned
Join Date: May 2009
Posts: 2,078
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
You ought to regrease such an old bike because the grease can dry out.
Try oiling the hub if it's a three speed. If it's a five, six, or 12 speed, the rear axle could be shot. See if you can move the rear rim from side to side relative to the frame without spinning the wheel; i.e. see if the wheel is a little loose on the axle.
You need to be careful with tire pressure because the rims don't have a little ridge inside them to hold the bead of the tire like modern rims. You can get new tires from Amazon if you need them. It should be fine to use a standard 26X1-3/8 tube.
Harriscyclery.net has aluminum EA3 rims but it will still be a heavy bike. The frame was welded from 1010 steel sheet metal. Electroforged Schwinns are just heavy bikes. I'd say leave the heavy classic alone and get something else for your performance bike.
Try oiling the hub if it's a three speed. If it's a five, six, or 12 speed, the rear axle could be shot. See if you can move the rear rim from side to side relative to the frame without spinning the wheel; i.e. see if the wheel is a little loose on the axle.
You need to be careful with tire pressure because the rims don't have a little ridge inside them to hold the bead of the tire like modern rims. You can get new tires from Amazon if you need them. It should be fine to use a standard 26X1-3/8 tube.
Harriscyclery.net has aluminum EA3 rims but it will still be a heavy bike. The frame was welded from 1010 steel sheet metal. Electroforged Schwinns are just heavy bikes. I'd say leave the heavy classic alone and get something else for your performance bike.
#10
Senior Member
Thread Starter
Join Date: Jun 2009
Location: mpls, mn
Posts: 81
Bikes: raleigh peak
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i am using it for the next month. it is a 5spd. the wheels feel tight. no side play. i spin them and make sure the brake pads are not dragging but they seem to stop pretty quickly. less than a few revolutions. thats what folks rode 30 yrs ago? must have all had big legs. yes, it has no future in my plans for biking.
#11
rebmeM roineS
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 16,216
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 653 Post(s)
Liked 348 Times
in
227 Posts
The Collegiate was one of many boat-anchor Schwinn bicycles of the period, assuming that is an Electro-Forged frame. Schwinn also produced a variety of lighter, higher-performance bicycles.
You should not feel side play on a bike hub. Perhaps those wheels would spin better if the hubs were cleaned, lubed and adjusted.
You should not feel side play on a bike hub. Perhaps those wheels would spin better if the hubs were cleaned, lubed and adjusted.
__________________
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
#12
Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,884
Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 821 Post(s)
Liked 771 Times
in
400 Posts
i am using it for the next month. it is a 5spd. the wheels feel tight. no side play. i spin them and make sure the brake pads are not dragging but they seem to stop pretty quickly. less than a few revolutions. thats what folks rode 30 yrs ago? must have all had big legs. yes, it has no future in my plans for biking.
__________________
Jeff Wills
Comcast nuked my web page. It will return soon..
Jeff Wills
Comcast nuked my web page. It will return soon..