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Inner tube sizes

I am changing 20x150 tyres to 20x1.75 tyres on My Dahon D7 Speed what size inner tube do I need.

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Most tubes don't come in specific width sizes, so the correct on may be 20x1.25-1.75 or 20x1.5-20 etc, you probably wont need to change the tube.

Posted on Nov 26, 2012


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SOURCE: Assembling a Dahon D7...

The manual is available here: It looks like the seatpost and seat are meant to be left in the bike.

Posted on Nov 29, 2009

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SOURCE: When I received my new

I think that bike has a v-brake on the front. You probably need to loosen the spring tension adjustment screws. On each brake, near the pivot, there is a small screw - turn them counterclockwise until you see a gap between the pad and the rim. If you don't have enough play, you may need to loosen the screw on the top of the right (i think) brake to give you some slack. Try the tension screws first.

Posted on Mar 02, 2011

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I has to change my WTB Velociraptor 44/50 tyres last week due to age and wear bu

I soon found out that the 44/50 on the tyre is a two-number system introduced by Wilderness Trial Bikes who make the Velociraptor tyres, and is called the GMS both sizes are in millimeters and refer to the size of the inflated tyre, I don't think that it was a popular sizing system I couldn't find much about it but this is what I found out.
  1. The first number is the width of the inner casing in this case 44mm
  2. The second number is the width of the outside tread 50mm
---------figure 1-----722b4b0.gif

These measurements are taken on a standard rim which is 20 mm wide at the bead-capturing point (inner measurement) , with a tyre inflated to 60psi (4 BAR) and maintained for 24 hours.

The recommended pressure range is from
40-75psi on most WTB tyres. Download the PDF on tyres sizes for all the WTB range.

NOTE: > 14.50 psi = 1 Bar

Common BSD (also in inches) vs Actual Wheel Diameter check out my GMS Tip HERE for more information on this critical Bead Size and Tyre size relationship

622mm (24.5") = 29" - Large MTB
622mm (24.5") = 28" - 700C
590mm (23.3") = 26" - Standard MTB
520mm (20.5") = 24" - Childrens MTB
451mm (17.8") = 20" - BMX

NOTE: The BSD of the tyre is always 15% smaller than the Actual Measured Wheeel Diameter

The WTB tyres also have one rotation for the front tyre the treads usually point in this direction and a rear tyre can be used in both directions depending upon its use either Dry Mud OR Cross Country Downhill

on May 14, 2010 | Cycling


Mountain Bike Wheelsize WTB and the Global Measuring System

I had to change my WTB Velociraptor 44 / 50 tyres last week due to age and wear but I didn't know what to replace them with, all knew was the inner tube that I had was marked as thin 26" x 1.5" / 2.2" so what does the 44 / 55 refer to ?

I knew that my rim was a 26" Mavic X138 quick release rim with a thin inner 16mm outer 20mm which I found was standardized by the following system

ISO System ( aka E.T.R.T.O.)

The ISO system uses two numbers for example 55 - 622

1. The first is the rim width is the inner width measured between the flanges as shown in the diagram so this would be 55mm, this is a wide rim most WTB are 20mm and narrow to save on weight
2. The second ISO number is the critical one, it is the diameter of the bead seat of the rim, in mm ("B.S.D.") in this case 622m or a 29" wheel, note this is not a straight conversion 520mm is only20.5"" this is because its the Bead Diameter not the total Diameter in this case would be 736mm

---------------Figure 1 0596e43.jpg

29" x 55/50 aka (55 622) on the wall of the a WTB Tyre this is what is means

1. The 29 is the size in inches of the wheel
2. The second set of numbers 55/50 is called the Global Measuring
by WTB describes the tread size at 60psi
3. The third set is the Tire Size Designation is the Tire Section Width or the outside width of the tire casing in this case 55mm, not the rim size which might be as narrow as 21mm
4. The second number is the Tire Bead Diameter in this example is 662 mm, this is not the full Diameter of the Wheel

26" X 44 / 50 is my WTB Velociraptor this is all I had to go on I knew it was a mid-range tyre due to the treads

1. The 26" is the BSD size in inches of the wheel ( 599mm )
2. The second set of numbers is called the Global Measuring
System by WTB which will take up to a 1.9" inner tube with a deep tread.


-- / -- ---------------> 26" x 1.5 " --- slicks or road tyres
-- / -- ---------------> 26" x 1.75 "
44 / 50 ------------> 26" x 1.9 " ---- WTB Velociraptor
47 / 50 ------------> 26" x 1.9.5"
47 / 52 ------------> 26" x 2.1 "
49 / 52 ------------> 26" x 2.14"
52 / 54 ------------> 26" x 2.24" ---- WTB Motoraptor
50 / 55 ------------> 26" x 2.3" ---- WTB Exiwolf
55 / 52 ------------> 26" x 2.4"
55 / 62 ------------> 26" x 2.5"
58 / 55 ------------> 26" x 2.55" ---largest tread chunky knobbly or ballon tyre


It is also worth adding that if you own a Bike Computer you will need to input the Wheel Size (WS) this is also the circumference in mm this can be calculated using 22/7 (approximation of Pi) x the Diameter, where the diameter of a fully inflated MTB tyre is the full 26', taking 1' = 25.4mm

26' = 660.4mm

660.4mm x 22 /7 = 2075mm

on May 14, 2010 | Cycling

1 Answer

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Jun 15, 2012 | Cycling

1 Answer

How to remove the front wheel on bike to change inner tube

If the wheel is quick release all you need to do is turn the lever one half turn clockwise, and the wheel should drop out of the forks.If , however, it is retained by nuts you will need the appropriate size spanner - slacken the nuts and drop the wheel out. Open the valve ( or if it's a car type- depress the pin to let the air out). Next you need a set of three tyre levers (from your local cycle shop) Carefully ease one side of the tyre away from the rim. If there is a lock ring on the valve, undo it.Pull out the inner tube and replace with a new one. Ease the tyre back into position being careful not to trap the new tube.Blow up the tyre, refit the wheel,tighten the nuts or quick release system.Ensure that the wheel is secure before riding the bike.

Sep 11, 2011 | Cycling

1 Answer

The tyre keeps going flat. The valve on the inner tube was replaced and the tyre pumped up, but by the time I got the tyre home it had depflated again. There was a worn area on the inner tube and there...

Not a guru on Bertini but most strollers with pneumatic tires use standard tyres and tubes as used on kiddy bikes. I get tyres for Bugaboo's at my local K Mart. The size should be on the side wall of the tyre.

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1 Answer

Can we change the size of rear tyre?

The tyre size is governed by the rim width and the space available in the wishbone. I would measure the space available for the tyres width right up inside the wishbone along with the tyre size that you have at present.
The tyre can be oversized but watch out for slipping on the rim of the wheel!
Consult a Yamaha Workshop for specialist tyre sizes and compounds. Pirelli make some super sticky tyres alowing for excellent high speed cornering!

Jan 01, 2011 | 2008 Yamaha YZF-R15

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Can I change my tires to a 265 R16 size, the actual original size of my GMC 2500 Sierra HD tires are 245 R16. My pick up have 6.6 diesel engine with an allison 6 speed transmition, and 2 x 4 configuration.

1st number is tread width (mm)265
r =speed rating
2nd is wheel size, in inches 16
the rule of thumb re tread width, is the tread should not exceed the inner wheel width,measured inside the wheel/tyre sealing area by more then 20mm.
otherwise car will tend to sway when steered for moose check your wheels first...
r rating only good upto 100 mph intermitently...

Mar 17, 2010 | 2008 GMC Sierra 2500HD 2WD

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Assembling a Dahon D7...

The manual is available here: It looks like the seatpost and seat are meant to be left in the bike.

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Hello, Our Jane Powertwin buggy has 3 flat tyres - they go down when inflated. From where can we buy new inner tubes please

You can get inner tubes at any bike store you just tell them what size they have all of them.

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