Michelin Wild Enduro Rear Gum-X 3D Competition Line 27.5" Tyre

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Please note: View 'Tyres Guide' below for ETRTO Sizing

Product Description

With the Micheline Wild Enduro Gum-X Tyre you can ride wherever you want. This is a tyre that is designed specifically for use on the rear wheel. 

  • More Speed: Rear specific tread pattern offers excelent performance.
  • More Grip: New Gum-X3d compound combining speed, traction and performance.
  • More Stength: Stong, lightweight Gravity Shield 3 x 33 TPI casing with pinch protection offers good security. 
  • Tubeless Ready.
  • Ebike Ready.

Occasionally, without notice, manufacturers change product design and/or specifications.

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Tyre Size Guide


Tyre Size Guide

Whether you are replacing a worn out tyre or want a performance upgrade, it is essential that you choose a tyre that is compatible with your bicycle as well as your riding style.

To find out which size tyre you will need have a look at the sizing information on your existing tyre. You can find this information on the side wall of the tyres, either in coloured print or embossed in the rubber itself. Both rim diameter and tyre width are shown in the size info.

Road  bike tyre sizing

Slim 700c road bike tyres on a Merida road bike

700 x 23c

A standard 700c road bike rim with a 23mm tyre width.

MTB tyre sizing

Knobbly wide mountain bike tyres on a rocky trail

27.5 x 2.3

A 27.5” mountain bike rim with a 2.3” tyre width.

You will notice that road bike tyres tend to me measured in metric units while mountain bike tyres use imperial units.

What Size Tyre Do I Need?

Ypu need to knnow your wheel size and tyre width when chosing a replacement tyre for your bike

Wheel size diameter on tyre sidewall for correct inner tube sizing

Wheel Size

Tyres are made to fit specific wheel sizes, so you need to know what size the wheel on your bike is.

The easiest way to do this is by looking at the tyres on your bike. On the sidewall you'll see a combination of digits such as:

700 x 28c (road bike wheel) or 27.5 x 2.4 (mountain bike wheel)

It’s the first figure that shows the diameter of the wheel or the wheel size.

The next figure is tyre width which is the other measurement you need to know.

Wheel size diameter on tyre sidewall for correct inner tube sizing

Tyre Width

Inner tubes are designed to fit a range of tyre widths, so the next thing you need to know is the width of your tyre.

This is shown in the second number that’s printed on the side of the tyre.

700 x 28c (road bike wheel) or 27.5 x 2.4 (mountain bike wheel)

When choosing an inner tube you need one with a width range that covers your tyre width as well as exactly matching the size of the wheel. See the tables below for examples.

Note: Sometimes metric sizes are shown as c instead of mm. This is just a different way of saying the same thing. A 25c tyre is the same width as a 25mm tyre.

Traditional and ETRTO sizing

Sometimes the sizing info is listed in two different ways; the traditional sizing method shown above and ETRTO sizing which lists the tyre width first and the rim diameter second. The rim diameter size is measured differently with ETRTO, for example:


This is a standard 700c road bike rim with a 23mm tyre width, which is the same size as 700 x 23c. 

We recommend that you use the traditional sizing method wherever possible as most tyres that we stock use this system.

Cube road bike with 700c tyres

Traditional and ETRTO tyre size tables

If you are unsure which tyre size you need you can use our handy comparison table to find the correct size tyre

Road bike tyre sizes

ETRTO Number Dimension
 700c road bike wheels
 18-622  700 x 18C
 23-622  700 x 23C
 25-622  700 x 25C
 28-622  700 x 28C
 32-622  700 x 32C
 37-622  700 x 35C
 47-622  700 x 47C

MTB tyre sizes

ETRTO Number Dimension
 26" mountain bike wheels
 50-559  26 x 1.9
 54-559  26 x 2.1
 55-559  26 x 2.2
 58-559  26 x 2.35
  27.5" (650b) mountain bike wheels
 50-584  27.5 x 1.95
 54-584  27.5 x 2.1
 57-584  27.5 x 2.25
29"  mountain bike wheels  
 50-622  29 x 2.0
 54-622  29 x 2.1
 55-622  29 x 2.2

What are the different types of bike tyres

While road, mountain and hybrid tyres have their own specific differences there are some features that are common to all tyres.

  • Clincher tyres - most bike tyres have a bead which hooks onto the rim to keep the tyre in place. Traditionally this bead is made from wire which is tough but heavy. Premium tyres use a folding Kevlar bead which is equally as strong as wire but is much lighter weight.
  • Tubeless tyres - while regular clincher tyres require an inner tube to keep them inflated tubeless or tubeless ready tyres form an airtight seal with a compatible rim so you don’t need an inner tube. These are most commonly found on mountain bikes as they can be run at lower pressures without risking punctures.
  • Tubular tyres - These are specialist road bike tyres that have the tube built into the tyre and are then glued onto a compatible rim.

Frequently Asked Questions

What size tyre do I need for my bike?

Look at the side wall of your tyre for any printed numbers indicating the size and width.

How do I know my bike wheel size?

The easiest way is to look at the side of your tyre. The size and width are printed on the tyre.

How do I choose a bike tyre?

Once the compatible size is known, choose an appropriate tread for the conditions you ride in.

Can I fit wider Tyres on my bike?

Look at your fork and frame where the tyre passes through, measure any available clearance to gauge what width tyre will fit.

Is a 28 inch tire the same as 700c?

700c wheels have a diameter of 622mm. While most 28 inch tyres are for a 622mm wheel, some are not. Check the ETRO number on the sidewall to confirm.

Please note, all size information is provided as a guide - if you're unsure or need any further assistance you can call us on 01792 799508 ... we're happy to help!

MTB Tyre Guide


MTB Tyre Guide


As your only contact point with the ground, the right mountain bike tyre can make a huge difference to your performance on the trail. With trail conditions varying in different locations and at different times of the year, choosing the best MTB tyre is not always obvious.


MTB tyres are measured by their width alongside the size of the rim that it is designed to fit. See our tyre size guide to learn more about specific tyre sizing. The conventional wisdom is that wider tyres offer more grip, as they have a more rubber in contact with the ground, while narrower tyres roll quicker as there is less rolling resistance. While this is true for MTB wheel/tyre combinations that have the same diameter, mountain bikes are available with different wheel sizes. A 29er rolls significantly quicker than a bike with smaller 27.5” wheels if they have the same width tyres fitted. This means that we need to think about wheel size as well as tyre size. Our bike wheel size guide explains this in more detail.

MTB tyre sizes


Tread pattern makes a huge difference to the performance of a mountain bike tyre. Generally speaking, the smaller and more tightly packed the knobs on the tyre, the faster the tyre will roll but the less grip it will offer. Grip is essential, but the amount you require will vary depending on the specific trail surface you’re riding on. A low-profile tread pattern like that found on the Continental X King will give you plenty of grip on hardpack trails, but you will need the bigger knobs of a more aggressive tyre - like the Maxxis Minion - to find grip on loose surfaces. Tyre choice is always a balance between grip and straight-line speed, and the best tyre tread pattern will be different for different riding styles as well as different trail conditions.

MTB tyre tread

An important consideration for UK riders, particularly if you like to ride natural trails, is how well the tyre can clear mud. If your tyre clogs up with mud easily you will lose grip more often, so dedicated mud tyres - like the Specialized Storm Control or Maxxis Shorty - have spike-like knobs with wide gaps between them to stop mud clinging to the tyre.

MTB tyre tread

While choosing a tyre for specific conditions is essential for racers, most mountain bike trail riders don’t want the hassle of changing their tyres before every ride. This is where a good all-rounder comes in. A tyre with a relatively open tread pattern, reasonably sized mid-tread and aggressive side knobs - like the Maxxis High Roller - offers the ideal balance between grip and rolling resistance without clogging up with mud in the wet.


The rubber on your tyres gives you grip by conforming to the lumps and bumps of the surface you are riding on. This means that a softer rubber compound will offer more grip than a harder compound. For the same reasons, a soft compound will be slower rolling than a hard compound. As with most things mountain bike related, there is always a compromise between speed and grip, so the ideal tyre compound will vary depending on the type of terrain you ride on. Soft compounds are preferable for downhill racing while harder compounds are a better choice for long distance cross-country rides.

Another thing to consider is durability. Soft rubber compounds wear considerably quicker than hard rubber compounds, especially in the centre of the tyre as it spends most time in contact with the ground. To take account of this, some premium tyres are made from multiple compounds, with harder compounds in the centre for improved durability and speed, and softer compounds on the side for improved cornering grip.


Mountain bike tyres need to be tough enough to cope with hard riding on challenging terrain. For this reason, mountain bike tyres are tougher than road tyres. Unfortunately making a tyre tough also makes it heavy. There is always a trade-off between weight and toughness. Cross-country race tyres are the lightest but are not recommended for anything other than racing due to a lack of durability. Downhill tyres are the toughest, with double thickness sidewalls to reduce the chance of getting a flat when the tyre pinches against the rim. These tyres are too heavy for efficient trail riding however.

In order to improve durability without adding too much weight, tyre manufacturers add tough abrasion resistant layers to their high-end tyres. Side walls are particularly vulnerable to cuts from rocks. Premium MTB trail tyres feature sidewalls reinforced with a lightweight abrasion resistant layer that protects the sidewalls of the tyres from cuts. Look for Specialized GRID, Schwalbe Evo, Continental Apex or Maxxis Exo tyres for the best side wall protection.


With their vastly improved puncture resistance, Tubeless tyres are fast becoming the norm on mountain bikes. When used with tubeless tyre sealant, small punctures will seal themselves without you noticing. Even larger punctures are easy to fix on the trail, as you don’t even need to take the wheel off the bike. See our tubeless repair video to learn how to repair a tubeless MTB tyre

Another advantage of tubeless tyres is that you can reliably run lower tyre pressures. This gives you more grip without the pinch puncture risk you get with inner tubes. While they take a little more effort to set up initially, this extra work is more than offset when you realise that punctures are almost a thing of the past. Converting to tubeless tyres is easy. Tubeless compatible tyres are often labelled ‘Tubeless Ready’.


Alongside wheel weight, tyre weight is probably the most important weight consideration on a bicycle. This is because of the rotational effect of the wheel which means that adding weight to the rim will slow you down more than adding weight anywhere else. You will notice the effect of a heavy tyre most climbing and accelerating, so is the first place to look when you want to make your bike lighter. The easiest way to reduce tyre weight without compromising performance is to choose a tyre with a folding bead. Folding tyres use a Kevlar bead instead of a traditional steel bead which is just as strong, but much lighter.

Tyre Pressure

One of the simplest ways to improve the performance of your mountain bike is to ride with the right tyre pressure. The ideal tyre pressure will vary depending on riding style, rider weight, and trail surface. You want your tyres to be soft enough to conform to the lumps and bumps on the trail, but not so soft that you bang your rims on rocks and roots, or the tyre folds over and squirms about while cornering.

If you are riding cross country trails or a trail centre loop, then you will want your tyre to be hard enough for efficient rolling on the climbs but not so hard that you loose grip on the downhills. For aggressive downhill riding lower pressures are ideal as they will give you more grip. Downhill tyres tend to have thicker reinforced side walls that help to prevent pinch punctures and give you additional support while cornering. Another consideration is that a higher-volume tyre will require less pressure than a thinner tyre for optimal performance.

There are too many variables to give an ideal pressure range here, but most mountain bikers will run between 20psi and 40psi. Lighter riders will benefit from lower tyre pressures, while heavier bikers will need higher pressures to get the right level of support from the tyre. Mountain bikers tend to run a couple of psi more in the back than the front, as it is the rear tyre that takes the biggest hammering. A simple rule of thumb is never to exceed the recommended tyre pressure, found on the tyre side wall, but don’t be afraid to experiment with lower tyre pressures, especially if you are running a tubeless set-up.

Winter Tyres

The main difference between riding off-road in winter compared to summer is that the trails don’t get much time to dry out. While we sometimes get muddy trails in summer, we’ll definitely have muddy trails in winter, probably all winter. This means it’s worth putting on tyres that can cope with mud as the days get shorter. Of course, if you only ride armoured trail centre trails then you can use the same tyres all year round, but part of the attraction of winter MTB riding is the fun you can have sliding around on muddy trails.

Tread Pattern

Tread pattern is key. A spiked tread is the best for muddy conditions as the long, well-spaced knobs can penetrate the mud to find grip beneath without clogging up. Of course, you are unlikely to ride through mud all the time, so unless you’re DH racing, you’ll want a tyre that still works on rocky and hardpack trails. This is where the intermediate or cut-spike tyre comes in. These have wide spaced blocky knobs that can penetrate mud and don’t clog up while still offering good support on hard surfaces. The Specialized Hillbilly and Maxxis Shorty are great examples.

Maxxis Shorty detail


Tubeless tyres offer a great advantage in soft winter conditions as you can run lower tyre pressures without risking pinch flats. Lower tyre pressures offer more grip, especially in wet and muddy conditions, as the tyre can conform to the ground more easily to find grip. Many experienced MTB riders will lower their tyres pressure when riding muddy tracks. To avoid bashing your wheel rim on rocks you can use tyre inserts like CushCore to cushion the tyre against impacts.

tyre pressure adjustment

Front & Rear?

The problem with mud tyres is that they roll less quickly, so many riders compromise with a front/rear split. Many MTB riders will fit a winter tyre on the front and leave a regular tyre on the rear. This way you get extra grip on the front wheel, where you need it most for control. The rear tyre effects rolling resistance more than the front so keeping your rear summer tyre on is a good compromise. As long as you’ve got control of the front end, sliding about in the mud is a lot of fun.

Winter MTB riding

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If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

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