To use the calculator below, select a wheel and tire size from the table or enter mm (used by most new cycle computers), cm (used by some cycle computers), . to a x 28C tire) has a tire width of 28 mm and a rim diameter of mm. set your wheel size without any calculations at all is to measure the distance you.
All tyres are marked with a pressure. Sometimes this is an absolute maximum that nobody should need to exceed, or sometimes only a recommended whee, that may be exceeded by heavier riders e.
Off-road tyres are usually marked with a pressure range, from the minimum that will support a rider of average weight to the absolute maximum.
Do not exceed the maximum when tyres are marked with a range. Skip to main content.
A guide to cycle tyre sizes. Cycle tyre sizes explained. By Richard Hallett Thursday, 5 July Are you confused by the markings on your tyres? Tyre size table The table below lists most of the sizes of tyre that are likely to be found in the UK.
Tubeless tyres Tubeless tyres, as the name suggests, do away with an inner tube and, in its absence, are reliant on the shape and hike of the tyre bead to ensure the tyre does not blow off the rim at high inflation pressures; in a conventional clincher tyre, the inner tube keeps measuremeent bead securely located under the rim hook.
It is inadvisable to use non-tubeless tyres without an inner tube as there is otherwise a risk of tyre blow-off. Tubular tyres Used primarily for racing, 700 by 38 bike wheel computer measurement tyres must be fixed to coomputer appropriate rim using glue, wwheel or adhesive tape.
Recommended measurfment All tyres are marked with a pressure. Sponsored Advert. David Cumquat 24 May at Stephen Ridings 14 September at Caleb Hood 20 September at Norc 4 October at Louis Bikeman garmin gps hrm watch February at Bicycle and Muscle Cars 25 May at Batman 10 July at Jeff Hrusko 3 November at Unknown 17 November 700 by 38 bike wheel computer measurement Marta Matos 18 December at Unknown 12 June at Unknown 10 September at Teri Ziert 30 September at Leanda Miller 23 January at Adrian Lobo 25 January at Marius MVS 28 February at Adrian Lobo 1 March at James 17 March at This is the most common cause of mismatches.
Although these size designations are mathematically equal, they refer to different size tires, which are NOT interchangeable. It is dangerous to generalize when talking about tire sizing, but I would confidently state the following:. If two tires are 700 by 38 bike wheel computer measurement with sizes that are mathematically equal, but one measurementt expressed as a decimal and the other as a fractionthese two tires will not be interchangeable. Competitive pressures have often led to inaccuracy bime width measurement.
Suppose you are in the market for a high-performance x 25 tire; you might reasonably investigate catalogues and advertisements to try to find the lightest available.
If the Pepsi Tire Company and the Coke Tire Company had tires of equal quality and technology, but the Pepsi was actually a marked as a 25, the Pepsi tire would be lighter than the accurately-marked Coke This would put Pepsi at a competitive advantage. In self defense, Coke would retaliate by marketing an even lighter labeled as a This scenario prevailed throughout the '70's and 700 by 38 bike wheel computer measurement.
The situation got so out-of-hand that cooler heads have prevailed, and measuremsnt is a strong but not universal trend toward accurate width measurements. The ISO system uses two numbers. The first is measuremnt in millimeters. street bike gps mount
For the rim, this is 700 inner width between the flanges, as shown in the diagram; for the tire, it is the inflated width. This will vary a bit 700 by 38 bike wheel computer measurement on the 700 by 38 bike wheel computer measurement of the rim. The second ISO number is the critical one: Generally, if this number matches, the tire involved will fit onto the rim; if it doesn't match, the tire won't fit. For example, a x 20 C road tire vike be a ; a x 38 hybrid tire would be a The width difference between these sizes would make them less-than ideal replacements for one anotherbut any rim that could messurement one of them would work after a fashion with the other.
If you pull the beads apart and measure the total width from bead to bead, it should be approximately 2. If its too wide for the rim, there's an increase risk of sidewall wear from brake shoes, and a greater risk of loss of control in the event accessories computers a sudden flat.
The tables below give a partial listing of traditional tire sizes, with their ISO bead-seat equivalents. The ISO comparison list at the bottom of this page covers all sizes which we know to be in production as of The fractional, decimal and Equip my bike with gps tracking lists cover common sizes.
Traditionally, fractional sizes are made for measurrment rims. As endurance bikes mature so the market measkrement pushing for even wider tyre compatibility.
Their ability to emasurement very fat tyres is partly davis bike loop gps these bikes have gotten popular. Some accommodate up to 45 or 50mm tyres, though there is nothing to stop you fitting narrower tyres if it's mainly for road use.
These bikes are designed for tackling a wide range of road surfaces and off-road tracks and a bigger tyre helps deal with bumpy terrain, provides grip and keeps punctures at bay. Tyre width and choice comes down to the wheeel use and the ratio of rough to smooth stuff.
Other manufacturers have taken more inspiration from mountain bikes, with bikes that can accommodate 2. While road racing cyclists have only 700 by 38 bike wheel computer measurement cottoned onto the benefits of wider tyres, touring cyclists have been advocates of wider tyres for years, where comfort trumps outright speed and computers in sports. Touring bikes come in many shapes and sizes depending on the intended usage, from light and fast tourers based loosely on regular road bikes to round-the-world heavy-duty models.
Tyre size typically varies from 25mm to 42mm, and some heavier duty touring bikes use inch mountain 700 wheels with even bigger volume tyres.
Many touring bikes are very traditional in design and use rim brakes, which limits the maximum tyre width, though some touring bikes use mountain bike style V-brakes to provide more tyre clearance.
Disc brakes are becoming common on touring bikes, like this Ridgeback Panorama below. With touring bikes, the tyre you choose depends on the sort of riding you want to do. Add in lots of off-road and gravel and you probably want a tyre with some tread to provide grip on the loose surface and comfort over the rough bikemate wireless bike computer. Road bike-style commuting bikes might accept 700 by 38 bike wheel computer measurement tyre of around 28mm width, often with space for mudguards, but some commuting bikes, and those based on mountain bikes, will take up to a 44mm tyre.
To help you choose the right tyre for your bike, tyres are made to a common standard, so you can easily find a tyre to fit your wheels.
This number is usually on the sidewall of the tyre, something like The first number is the inflated width of the tyre, the second figure is the diameter of the bead seat of the matching rim, in millimetres. If your tyre and rim have the same bead seat diameter, they'll fit together.
If not, they won't. People who deal with older and more obscure bike types have to worry about this stuff, as there are some combinations that 700 by 38 bike wheel computer measurement like they will fit, but don't.
However there are only a handful of tyre sizes in common use for adult bikes can samsung g3 act as bike computer the UK. Far and away the most common size for road bike wheels is usually referred to as C and has a bead seat diameter of mm.
The 'C' bit comes from a traditional French wheel standard based on the outer diameter of the inflated tyre, mm. Originally, C tyres were quite fat, to get the tyre to mm 700 by 38 bike wheel computer measurement, so ETRTO and C describe the same wheel size but mm is the actual measurement of the rim while C describes the outer diameter of the tyre.
Measureent a big range of tyre widths now available for mm rims: The big-wheeled mountain bikes known as 29ers bike gps london use this size, so there are off-road tyres up to a whopping 75mm wide.
As mentioned above, expedition touring bikes also occasionally use the inch tyre 700 by 38 bike wheel computer measurement popularized by mountain bikes in the s, which has a bead seat diameter of mm.
Some bikes intended for junior and smaller riders use a different inch size, C, with a mm bead seat diameter, and you very occasionally encounter yet another alleged inch size, A with a mm bead seat diameter.
Another inch variant, B, is popular for mountain bikes and has a bead seat diameter of mm; Cannondale uses this size for its Slate gravel bike and British framebuilder and road. The CTC recommends the ideal relationship between a rim and tyre as being about 1. Rims measuring 15 to canyons smart bike computer across are the most common used for road bikes and accommodate tyres ranging in width from 23 to 50mm. Schwalbe 700 by 38 bike wheel computer measurement produced this handy table which lists recommended tyre and rim width combinations.
While you might be able to fit wider tyres to your rims, you might not 700 by 38 bike wheel computer measurement have clearance in the frame and fork to accommodate the wider tyres. A bike manufacturer usually specifies a maximum width tyre for each model in its range, with a safe range of clearance between the tyre and frame, and you can normally find this information on its website.
News:History of bicycling distance and speed measuring devices; calibration procedures; This article describes how to calibrate the wheel sensor of a bicycle computer or GPS unit in the easy X 38, , , , , , , Missing: Choose.
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