Nutrak Speedster 14" Junior Tyre

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

Product Description

Key Features:
  • Wire bead multipurpose compound junior tyre
  • Honeycomb centre tread provides low rolling resistance and excellent traction in wet and dry conditions
  • Extremely durable and grippy
  • 27TPI
  • Colour Black
  • Wheel Diameter 14 inches

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

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:

23-622

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!

Tyres Guide

What type of tyre do I need? 

It’s best to choose a bike tyre based on the type of riding you’re going to be doing.  

Road bike tyres 

Road bike tyres are identified by a smooth tread pattern and narrow width for speed and efficiency.  

Mountain bike tyres 

MTB tyres are much wider with chunky tread for added grip on off-road conditions.  

Hybrid/ commuter tyres 

These tyres will often blend characteristics from road and MTB tyres with added puncture protection for daily durability.  

Does tyre width matter?  

Thin tyres are fastest as they have low rolling resistance and are more aerodynamically profiled.  

Wide tyres are more comfortable and stable due to the increased contact patch with the ground.  

How to check your current tyre size? 

Take a look at the sidewall of your current tyres and you’ll see one or two sets of figures;

One is the traditional size like 700x28c or 27.5x2.2.  

The first figure is the tyre diameter (size). The second is tyre width. Note: road bike sizes are in mm, MTB sizes are in inches

The other set of figures you may see is ETRTO sizing like this 28-622.

The first number here is tyre width while the second number relates to wheel diameter.

Here is a comparrison chart for traditional and ETRTO sizing to help you choose the correct tyre size.

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
 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

Will this tyre fit my wheel?   

Your new tyre must be the same diameter as your current one (to fit your wheel rim).  

Then, you need a choose a tyre which will fit your frame.  

Road bike tyres are generally 21 – 28mm wide 

MTB tyres can range from 1.5”-5” 

To make things complicated road tyres are measured in mm, while MTB tyres are in inches.  

How wide is too wide  

You want to leave at least 4mm clearance between your frame and tyres to prevent rub and allow for mud clearance. 

Measure the following areas on your frame: 

Fork crown (top) 

Brake calipers (make sure you squeeze them) 

Chainstays 

Seatstays 

Subtract 4mm and you’ll have the maximum width your frame can handle.  

What is the best type of tyre for daily riding? 

If you’re commuting, riding and training daily you’ll want a tyre with some form of puncture resistance. 

Puncture resistance often comes in the form of a harder or thicker rubber compound, or a protective layer running underneath the tread pattern.  

What are tubeless tyres 

Tubeless tyres do not have an inner tube. The tyre and rim of your wheel (you need a tubeless ready rim) create an airtight seal with the valve directly mounted on the rim. 

You can run these tyres at lower pressures for an improved ride quality. A bigger contact with the ground means you have improved traction when cornering. 

Tubeless tyres often come with liquid sealant that creates a seal that may heal itself on a small puncture so you can keep riding home.  

Delivery & Guarantee

UK Delivery Information

International Deliveries – Temporarily Suspended 11/11/20

Note: We are still offering deliveries to the Isle of Man, Scottish Highlands, Scottish Islands, Channel Islands, Isle of Wight, Jersey and Guernsey. 

Courier Delivery update: Due to the COVID19 situation, we are currently experiencing some delays with deliveries. Our couriers are working around the clock to get your order to you as soon as possible but there is a potential delay of up to 48 hours . Please check your tracking on track your order here.

Please download the TNT Track and Trace App for iOS here and Android here so you can keep an eye on your delivery and any further updates.

Please note on the TNT tracking app it may show your delivery status as ‘Collecting’ (as per image below). This means your delivery has left our warehouse and is currently held at TNT main depot and there could be up to a 48 hour delay.

tnt delivery

Please keep checking the TNT tracking for further updates. On behalf of TNT we apologise for any delay and inconvenience this may cause. 

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

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.

For more information please visit our Returns & Warranty page.

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