Choosing the right tires
Which tires ATV choose?
The importance of tire choice is paramount, remind that these are the few centimeters between the road and the bicycle which allow you to brake, turn, or just stand .. It is therefore important to adapt the tires to the output ATV that you want to do.
In our programs, we advise you to have a minimum cross section of 2.25, be reinforced sidewalls and thus weigh at least 850grs.
It is possible in a glance and with some tricks that we will see to know the practice and the conditions that may face particular tire according to the inscriptions on each brand and listed on the tire sidewall.
Today we mainly 3 sizes (diameter) wheels which have become standard, the unit is inches (English measure unit):
26 '(or 26 inches)
27.5 '(as noted in cycling 650B)
Section of the tire
The section represents the width of the tire, it is these famous figures 26x 1.9, 2.1, 2.80, ...
the unit is the same as the diameter, ie inches (1 inch = 2.54cm), in the case of our examples it is about:
- 1.9 = 4826 cm - 2.1 = 5.334 cm - 2.8 = 7.112 cm
To give an idea, an ATV tire less than 2.1 is considered small.
A section (width) allow a higher low inflation, reducing rolling resistance (and therefore fatigue), more mathematically, this will be lighter because less material will contain a wider tire. Conversely, a larger section allow greater comfort and better shock absorption and protect a little better the rim, finally, his greatest footprint hypothetically improve adhesion.
To image all this is why we find in Downhill (DH / Down) tires with very large sections to absorb the roughness of the soil and enable a much better grip. Conversely, cross-country, where reminders are needed, a fine will reduce tire rolling resistance.
For information and if you should choose a versatile tire, try to approach a 2.3 inch section, allowing you to cover a maximum of practice.
ATV tire carcass
A mountain bike tire carcass is mainly composed of nylon, or cotton braided, one can play on the stiffness of these to offer more strain and shock absorption for example. The index of flexibility shown by the acronym TPI (Threads Per Inch) that we will see a little lower. Above this layer son, we have the cap, which will be composed mainly of rubber and will play on the density, strength and appearance of the tire.
TPI (Threads Per Inch)
The CFI means the weave density (son of numbers per inch) carcass. Over this is high, the better its quality and resistance. Note that the weave density has an impact on the weight of the tire, so it's a story of compromise between lightness (more working and less comfortable) and a higher TPI for better wear resistance and comfort against more substantial weight. Above 100 TPI we have a very soft tire, considered upscale.
The gum hardness
Have you ever heard or read such values as 42A when there was talk of a tire? Yes ? It is simply its hardness in the image of our pencils.
In the ATV, we have a scale (Shore A) ranging from 40A indicating a very soft rubber to a maximum of 75A for a very hard compound.
If you need grip, soft rubber is to foster, noted that more gum will be tender and its wear will be.
In this sense, it is often advisable to put a softer tire at the front for better grip, with a harder tire in the rear of who will handle shocks and avoid getting his studs tear in rocky areas.
The flanks of a tire
Single fold: This is the thickness of the sidewall (weaving + gum) simple ply tires are very light but less resistant to pinch flats and low pressures. They conviennet to practice track and XC trails. Weight 550grs to 700grs between.
Exo protection: This is the Maxxis process to strengthen the blank of his tires without weighing it down too by adding a Kevlar belt. These tires suitable for all mountain and enduro. Weight between 780-900grs.
Double fold: The walls of the tire carcass can be reinforced by various methods such as double Pi, which will provide a stiffer sidewall and resistant, so it will accept tire to drive on lower pressures but will be heavier a tire without lateral reinforcements. Typically these tires are designed for DH and rigid rod. Weight between 1150-1250grs.
Rod flexible or rigid?
The flexible rods have the main advantage of weight! They are usually composed of Kevlar whereas the rigid rods are made of steel. More flexible rods have the advantage that they can be easily folded and stored in a bag.
The rigid-rod front tire offers improved rigidity and keeps the rigidity even in low pressure thus avoiding off the rim.
The studs of a tire
We end up the cleats, visible part of the tire (relief). At the rear, the tires usually have aggressive crampons placed perpendicular in direction of rotation, so the "bite" to the maximum the ground.
At the front, the tire is very important. Indeed, it is he who determines the precision and traction in curves. The spikes are more aggressive on the edges of the tire to facilitate exceptional traction when the bike is leaned. They are oriented parallel to the direction of travel, as these plays no role in motor cycling.
Types of crampons
Tires equipped with small spikes will give you a lower rolling resistance, they are suitable for dry land and compact requiring a special structure to remove the mud for example. Lightweight and responsive, they will be perfect to avoid wasting energy when raises and mounted as with Maxxis Crossmark
Conversely, tires with large spikes will improve your grip (grip) are losing working capacity by cons, it is more suited to the more soft ground.
Note that we often find tire combining two profiles with a tread (surface on the top of the tire) have small studs allowing better performance accompanied larger studs on the sides for increased traction in cornering as Maxxis Minion at SS
Last observing the spacing between the spikes! The more they are spaced, the better the discharge capacity of the land and residues, unlike a tire with spikes close profile will gain in working but "bourrera" in the fatty parts thus losing all his motor capacity Maxxis as Shorty.
Tubeless or Tubetype?
The side of Tubeless, they form with the rim, a tight together as we can see with the tires of cars and motorbikes. The rod of a tubeless MTB tire is specific because it can "clip" the tire on the rim (provided for that purpose). This type of tire has been introduced into the ATV to reduce the risk of punctures (eg by pinching the tube), and to increase the traction of the tire by allowing lower inflations. We have two possible formats:
Tubeless ready: They can be fitted without an inner tube (provided you have tubeless rim-compatible, ie to waterproof). The tightness of this tire is not complete and will require the addition of a sealant such as a puncture bomb).
Tubeless: This time, the tires are completely sealed and requires no special treatment, the design of the tire is more accurate, more dense to prevent any leaks.