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Tubeless Ready
Tire Dimensions
Size Markings
Bicycles
Tire dimensions
What is the exact circumference of my tire?
City / Touring
Why is it that tires are often actually narrower than the ETRTO tire
Tire Construction
Off-Road section width?
Tire Types
Will the tire fit my frame?
Road
Which tire fits which rim?
Tire Tread
Cyclo-Cross Can I use a narrower rim?
Rolling Resistance
E-Bikes
Tire Wear
Recumbent
Tire Tube
Dirt / BMX
Valve
Clearance
What is the exact circumference of my tire?
Fitting
Tubes
Inflation Pressure
In order to accurately program a bicycle computer it is generally necessary to
Wheelchairs
enter the exact tire circumference.
Rim Tape
The tire circumference varies depending on the rim, the tire pressure and the
Tires
load on the tire. For these reasons, it is not possible to list exact tire
Tubes
circumferences. In order to accurately program a bicycle computer, we
recommend a simple rolling test with the rider on the bicycle.
Scooters
The approximate tire circumferences for the most common sizes are listed in the
Scooter Tires table below.
Moped Tires
Inch ETRTO Approx. Tire Circumference
Tubes
16" 50-305 1265 mm
Accessories
35-349 1325 mm
Clothing
Replacement Studs
37-349 1330 mm
Rim Tape
18" 40-355 1380 mm
Tubular
Accessories
50-355 1440 mm
Helpful Tools
Promotions
20" 35-406 1510 mm
Schwalbe Points
40-406 1540 mm
Product Search
47-406 1580 mm
Size: by ETRTO
50-406 1600 mm
User login
54-406 1620 mm
Username: *
60-406 1650 mm
Password: *
24" 47-507 1900 mm
50-507 1910 mm
Log in
Create new
54-507 1930 mm
account
Request new
57-507 1955 mm
password
60-507 1980 mm
Search
62-507 1995 mm
Search
26" 25-559 1950 mm
35-559 1990 mm
40-559 2030 mm
47-559 2050 mm
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 50-559 2075 mm
54-559 2100 mm
57-559 2120 mm
60-559 2160 mm
37-590 2100 mm
28" 20-622 2100 mm
23-622 2125 mm
25-622 2135 mm
28-622 2150 mm
30-622 2160 mm
32-622 2170 mm
35-622 2185 mm
37-622 2200 mm
40-622 2220 mm
47-622 2250 mm
50-622 2280 mm
54-622 2295 mm
60-622 2330 mm
32-630 2220 mm
40-635 2250 mm
Why is it that tires are often actually narrower than the ETRTO tire
section width?
Standard tire widths are calculated using fairly wide, standard rims. Yet in
practice, narrower rims are used more often, which in turn leads to tires
becoming slightly narrower as well.
In order to ensure that tires have sufficient frame clearance, tire
manufacturers generally prefer to keep production closer to the lower end of the
permitted tolerance (+/- 3 mm).
Carcass casing materials have become more and more sophisticated over time,
that reduces the tire widening after the fitting. In order to correct this tire
widening, over the past few years slightly wider carcasses have been used, so
that the actual widths are now much closer to the standard widths.
Will the tire fit my frame?
The question whether tires will fit into a particular
frame is often asked in relation to our ultra-wide tires.
It is easy to appreciate that with the large number of
different bicycle models it is impossible to check the
compatibility of all framesand tires.
The following list shows the exact diameters and
widths of our ultrawide tires. This should allow you to
identify if there is sufficient frame clearance for the
selected tire.
Image
A = max. width
B = max. diameter
C = diameter at max. width
Maximum Maximum Diameter at
Inch Tire
width diameter maximum width
Big Apple
20" 60 mm 529 mm 469 mm
60-406
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Al Mighty
26" 60 mm 684 mm 670 mm
60-559
Al Mighty
65 mm 693 mm 673 mm
60-559
Big Apple
60 mm 693 mm 616 mm
60-559
Big Betty
61 mm 690 mm 668 mm
62-559
Crazy Bob
61 mm 681 mm 625 mm
60-559
Fat Albert
59 mm 688 mm 664 mm
60-559
Fat Frank
60 mm 690 mm 664 mm
60-559
Racing Ralph
59 mm 687 mm 660 mm
62-559
Space
59 mm 682 mm 677 mm
60-559
Big Apple
29" 49 mm 727 mm 676 mm
50-622
Big Apple
60 mm 745 mm 678 mm
60-622
Little Albert
56 mm 741 mm 735 mm
54-622
Marathon Supreme
49 mm 725 mm 676 mm
50-622
Marathon XR
49 mm 725 mm 701 mm
50-622
Which tire fits which rim?
The inner diameter of the tire must match the rim
bead seat diameter. For instance, a tire size 37-622
fits on a 622 x 19C rim. The inner diameter of the tire
corresponds to the rim bead seat diameter of 622
mm.
Furthermore, the tire width must match the rim width.
The following table shows possible combinations of
tire widths and rim widths according to ETRTO.
Since 2006, the combination of extra wide tires and
narrow 17C and 19C rims is officially approved by
ETRTO. This just caught up with reality, because this
combination has already been an every day occurance
in MTBs and Balloonbikes for many years and has not
caused any problems.
Often the use of a wider rim is useful because it
brings additional stability to the tire. The tire pressure
can be reduced slightly before the stability becomes
 spongy .
European Tire and Rim Technical Organization Standards Manual - 2007
Tire section width
Rim width
18 20 23 25 28 32 35 37 40 44 47 50 54 57 60 62
(mm)
13c x x x x
15c x x x x
17c x x x x x x x x x
19c x x x x x x x x
21c x x x x x x x x x x
23c x x x x x x x x x
25c x x x x x x x
27c x x x x x x
29c x x x x
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Can I use a narrower rim?
W ide tires are often fitted on narrower rims, as with
Mountain Bikes, and also our BIG-APPLE tire. This
saves weight, but it is also because very few wide
rims are actually available in the market.
The rim manufacturer should be consulted before such
fitment and only if they judge it safe. In order to
prevent excessive stress on the rim, we advise not to
inflate the tire to maximum pressure.
As a general guide, MTB tires of say 54 mm width fitted on standard 17C and
19C rims should not be inflated to more than 55 psi. Very wide tires of ca. 60mm
fitted on narrow rims should not be inflated to more than 45 psi. Under no
circumstances should rims of less than 17 mm be used.
Rim according to Recommended max. pressure with narrow
Tire width
ETRTO rims (17C/19C)
54 mm 21C 55 psi
57 mm 21C 50 psi
60 mm 21C 45 psi
Schwalbe North Am erica " Ferndale, WA 98248 " Tollfree 1-888-700-5860 " Fax [phone]
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