TECH

General Tech Information

Tire Construction
Tire Construction
 

Encompassed within every Avon motorcycle tire is some of the world’s most advanced tire technology. It’s what helps give Avon Tyres their edge. This technology has been painstakingly developed and tested over many years and means that regardless of what type of bike you have and where you ride, you can have absolute faith in your tires.

Tire Compounds

 

Diagram #1:>
 
Technical Symbols
Technical Symbols
 
Hybrid Belt
Hybrid Belt
Ultra strong steel wires of different tensions bound together to make a tape component to form a unique belt system. This belt produces exceptional high speed stability while the flexibility and natural spring properties of steel translate into superb mechanical grip. This is our most advanced belt
system yet.
TE
TE (Tri-compound Extrusion)
Three different rubber compounds are extruded into each tread.
Compound 1 – A durable medium compound in the centre of the tyre for improved mileage.
Compound 2 – A soft compound on the edge of the tyre for maximum grip at high lean angles.
Compound 3 – A very soft low hysteresis compound across the entire base of the tread to improve the bond between the other two compounds and the carcass.
A-VBD
A-VBD (Advanced-Variable Belt Density)
Stands for Advanced-Variable Belt Density technology, specifically for rear tires. This is a jointless belt of ultra-strong Steel or Aramid strands running around the tire’s circumference. At the center of the tread the strands are very closely spaced for maximum stability and high wear resistance. The closer you get to the edge of the tread, the further apart the strands are spaced – this broadens the tire’s footprint when you’re getting your knee down.
Reactive Footprint
RF (Reactive Footprint)
Reactive Footprint technology marries Avon’s unique variable belt density A-VBD carcass with Lifetime Profile Engineering (LPE) to produce a footprint which changes size and shape depending on the bike’s lean angle for the full life of the tire. The result is a contact patch that grows as the bike leans, giving long life when travelling in a straight line and more grip in corners.
ATAC-TA Tread Profile
ATAC-TA Tread Profile (Advanced Tread Arc Combination – Tri Arc)
ATAC varies the tread profile across the tyre for the ultimate in handling and stability however far over your bike is. Works in tandem with A-VBD.
SRS-Compound (Super Rich Silica-Compound)
SRS-Compound (Super Rich Silica-Compound)
Compounds formulated with large amounts of silica offer enhanced grip in wet and cold conditions. This produces extra grip when the tire is cold but also reduces excessive heat build up which can affect mileage.
Race-C
Race-C
Compounds optimized for track performance.
EAF Pattern
EAF Pattern (Enhanced Aqua Flow)
Front and rear tread patterns are computer designed for maximum throughput of water within the tyre footprint. This propels water away from the contact patch hence aiding water dispersion and maximising wet grip.
ES System
ES System (Enhanced Stability System)
The carcass, sidewall and tread pattern are designed to work together to reduce localized flexing within the tire’s contact patch. This increases grip and stability while at the same time reduces tire wear.
IFG(Inverted Front Grooves)
IFG (Inverted Front Grooves)
For the front tire, a system pioneered by Avon in the late eighties and only now being adopted by the competition, resists ‘stepped-wear’ and cupping to deliver smooth handling throughout the tire’s life. By significantly reducing uneven tread wear, a further advantage of the IFG configuration is improved wet braking and shorter stopping distances.
LPE(Lifetime Profile Engineering)LPE (Lifetime Profile Engineering)
This works in conjunction with ATAC to produce a tyre profile and footprint which even when worn, gives consistent handling and stability for the full life of the tire.
WCTA (Wide Custom Tread Arc)
WCTA (Wide Custom Tread Arc)
A profile for improved manoeuverability at all speeds.
FFG
FFG (Force Following Grooves)
Grooves that work in tandem with the forces being transmitted through the tyre at various lean angles for increased wear resistance, optimum water dispersal, reduced tyre noise and improved mileage.
 
Load Index and Speed Rating Symbols
Load Index and Speed Rating Symbols
 

Load Index

LI KG LBS LI KG LBS LI KG LBS LI KG LBS LI KG LBS LI KG LBS
43 155 342 51 195 430 59 243 536 67 307 677 75 387 853 83 487 1074
44 160 353 52 200 441 60 250 531 68 315 694 76 400 882 84 500 1102
45 165 364 53 206 454 61 257 567 69 325 716 77 412 908 85 515 1135
46 170 375 54 212 467 62 265 584 70 335 739 78 425 937 86 530 1168
47 175 386 55 218 481 63 272 600 71 345 761 79 437 963 87 545 1201
48 180 397 56 224 494 64 280 617 72 355 783 80 450 992 88 560 1235
49 185 408 57 230 507 65 290 639 73 365 805 81 462 1019 89 580 1279
50 190 419 58 236 520 66 300 661 74 375 827 82 475 1047 90 600 1323

Note: 1Kg=2.2lb

The service description found in the tyre specification tables above consists of a Load index and Speed symbol. The Speed Symbol indicates the maximum speed at which the tyre can carry a load corresponding to its Load Index. The Load Index is numerical code associated with the maximum load a tyre can carry.

Speed Symbols

Speed Symbol J L P S T H V (V) W (W) ZR
Max mph 62 75 93 112 118 130 149 >149 168 >168  >150*
Max Km/h 100 120 150 180 190 210 240 >240* 270 >270* >240*

* denotes at reduced loading

 
Look after your tires

Look after your tires
 

What are the only things separating you from a nasty attack of gravel rash? That’s right, your tires. And in order for your tires to give you their peak performance, they need a bit of regular – as in every week ‘regular’ – care and attention. It doesn’t take long to check over your tires; after all, there are only two of them and they’re very easy to get at. But by inspecting them carefully for damage and keeping a close eye on their pressures, you’ll not only get more performance and longer life out of them, you might well save yourself from a potentially serious accident. That may sound a little melodramatic, but it’s the truth.

The following guide tells you what to look out for and why you should do it, but if ever you’re in any doubt, pop in to your local Avon Tyre dealer and ask for their advice. Once you’ve got into the habit of regular checks they’ll take no time at all – they could well save your life (as well as save you money in tire wear and extra fuel costs) so please, read on.

Have you got the right tire?

Just because a tire will fit on your bike doesn’t mean it’s the right tire. Check your bike’s handbook to see what the right specification should be, or if you’ve lost the handbook ask your local Avon dealer for help. The speed and load ratings for your tires should be the same as the original fitment items – never fit a tire of a lesser specification. And although it is possible in certain circumstances to fit a tire of a non-standard dimension, always seek the advice of either your bike’s manufacturer or your Avon Tyre dealer before doing so.

Pressures up to scratch? Maintaining the correct tyre pressures is critical to your safety, so never think, ‘oh, they’ll do’. Check in your handbook (or with your local Avon dealer) to see what’s right for the speeds you’ll be riding at and the load you’ll be carrying, then take the pressures when the tires are cold – leave it an hour after you last rode the bike. The tire pressure gauges in garages are notoriously inaccurate, so invest in a digital pressure gauge; they’re inexpensive and can be found in most bike and car accessory shops.

Correct pressures – Your tire is designed to perform perfectly at a very specific pressure. Inflated correctly, it provides the optimum contact patch for superb roadholding and water dispersal, as well as giving good handling, comfort and lifespan characteristics.

Under-inflated – A tire with too little air in it has a distorted contact patch, reducing its roadholding and ability to cut through water. As if that weren’t worry enough, the tire’s carcass is forced to deal with stresses and strains it wasn’t designed for, which increases the risk of accidental damage. Tire wear increases, too, and your bike will be unable to put down all of its power effectively – bad news on all counts.

Over-inflated – Too much air means you’ll wear out the center of your tire more quickly, which is going to hurt you in the pocket. Your bike’s handling will suffer, too, and there’s the distinct possibility of fracturing the tire’s casing and badly cutting its tread blocks – not to be recommended.

Use your eyes – Some problems you can see for yourself – cracks, bulges, splits, things like nails and stones embedded in the tread. Some of these things can be dangerous, so if you spot something potentially nasty, get it looked at by a specialist at your local Avon supplier, and remove items stuck in the tread straight away; if left, they could embed themselves further and puncture your tire. And if there’s any evidence of the casing showing through the rubber of your tire, replace it immediately – it’s dangerous and illegal.

Tread pattern – Although the minimum tread pattern depth is 1mm or 2/32 of an inch, it’s advisable to replace your tyres before they become that worn. If the tread pattern shows signs of uneven wear, check the pressures carefully and also check out the alignment of your bike’s frame and forks.

Valve cores and caps – Pressure loss from your tires can sometimes be caused by poorly seated valve cores – try tightening them down into place, or if they’re worn, replace them. And remember that valve caps actually do a job – keeping dust from the valve mechanism – so try not to lose them.

And some other things to keep an eye on…

As well as the frequent checks on your tires, here are a few other tips for keeping your tyres in tip-top condition.

Wire wheel worries – Before fitting a new tube and tire to wire wheels, check the rim tape all the way round the rim – if a spoke head pokes through it could cause a puncture.

A question of balance – Despite the most stringent quality programs, most tires and wheels have a ‘heavy’ spot that can cause vibration through your handlebars and frame. When fitting new tires, always have them balanced – on the wheel – by a specialist Avon Tyre fitter.

 
Safety
Safety
 
Important Information

Tires are the only part of your motorcycle that are in contact with the road. Safety in acceleration, braking, steering and cornering all depend on a relatively small area of road contact. It is therefore of paramount importance that tires should be maintained in good condition at all times, and that, when the time comes to change them, suitable replacements are professionally fitted.

It is essential that you refer to your machine manufacturer’s handbook when buying and fitting replacement tires. Changes in tire size, type and construction should not be made without first seeking advice from the machine or tire manufacturer, since fitting the wrong tire may have an adverse effect on handling, safety and wear.

Avon motorcycle tires are only for use on vehicles for which motorcycle tires were originally specified by the vehicle manufacturer, any other use may be dangerous.

Motorcycle tires which have been subject to use on rolling roads must no longer be used for subsequent, normal service. Use of Avon motorcycle tires on a rolling road (Dyno) will invalidate the tire warranty. All tests on rolling roads must be carried out with test tires, special tires reserved for maintenance purposes, or tires which are worn out or downgraded.

For fitment recommendations please see Avon Tyres – Motorcycle Data and Fitment Guide. All speeds stated in this brochure are subject to observance of the appropriate national speed limits.

Running In Tires

When new motorcycle tires are fitted for the road, they should not be subjected to maximum power until a reasonable ‘running in’ distance has been covered. 100 dry miles (160km) is the recommended minimum (discount any wet miles covered).

Tires should then be visually examined and their inflation pressure re-checked before riding.

 
Tire Pressure Guidelines
Tire Pressure Guidelines (PSI)
 
Note:
This is a wide range recommendation for average conditions only.

  • Solo category based on rider weight & riding gear up to 200 lb/91 kg & no luggage
  • 2 up light category based on two riders, riding gear & luggage
  • 2 up heavy category based on two riders, riding gear, luggage & trailer tongue weight.

High-speed riding, higher loads on high road temperatures may require a moderate increase in pressure.
Contact Avon Customer Service for psi recommendations for your riding conditions at (800) 624-7470.

 
Sport/Sport Touring (Radial & Bias)
Front Solo 2 up light 2 up heavy
80/90-3.25 32-34 32-34 34-36
100/80-3.50 32-34 34-35 35-36
110/70-120/90 34-36 36-38 36-38
130/60-150/80 34-36 36-38 38-40
 
Rear Solo 2 up light 2 up heavy
4.00-100/90 34-36 36-38 38-40
4.25-110/90 34-36 36-38 38-40
120/80-130/90 36-38 38-40 40-42
140/70-200/50 38-40 38-42 40-42
140/90-150/90 38-40 40-42 40-42
200/55-330/30 38-40 40-41 40-42
Touring Cobra Tires with bias belted reinforced construction*
  Solo 2 up light 2 up heavy
Front 38-40 40-41 42-43
Rear 44 46 48-50
 
*Front MT90HB16, 130/80B17, 130/70HB18, 120/90H18
*Rear 140/90H15, 150/90HB15, 170/80HB15, MT90HB16
  140/90HB16, 150/80HB16, 160/80HB16, 150/70B18
All other Touring/Cruiser Models
  Solo 2 up light 2 up heavy
Front 38-40 40-42 42
Rear 38-40 40-42 42
Dual Purpose
(125-500cc) Solo 2 up light 2 up heavy
Front 24-31 26-34 28-38
Rear 27-34 29-37 31-40
(501-749cc)  
Front 24-34 26-36 28-38
Rear 31-36 33-38 35-40
(750-1100cc)  
Front 31-33 33-35 35-42
Rear 35-37 37-39 39-42

 
Common Tire Issues
Common Tire Issues
 

Dry Rot/Weather Checking (fine lines on Sidewall)

This is usually seen in the spring after bikes have been stored for the winter. Also very hot,
sunny climates are hard on tires. Ways to avoid dry rot:

  • Keep both tires up off the ground in winter
  • Use mild soap & water to clean tires, not tire cleaners or preservatives
  • Avoid exposure to fertilizer, ozone, extremes in temperature, chain lube spray
  • Do not park under electrical wires nor near electric motors e.g. furnaces
  • Don’t store near gasoline or solvent tanks (hydrocarbon fumes)
  • Use bike cover to protect tires from extreme sun conditions

Groove Cracking

This is usually a result of under or over inflation. Contact your tire manufacturer for correct pressure if after-market tires are mounted. Provide weight of rider(s), luggage, and trailer. Also check front forks, suspension.

Avon motorcycle tires are only for use on vehicles for which motorcycle tires were originally specified by the vehicle manufacturer, any other use may be dangerous.

Handling problems

These can be caused by the following:

  • Incorrect inflation pressures. Remember tires can lose on the average 1 pound
    per month or 1 pound for every 10º F drop in temperature in the tire
  • Misalignment of frame
  • Luggage not balanced evenly on bike or mounted hanging over rear end of bike
  • Weight too far forward or back (riding position)
  • Poor suspension components condition or adjustment
  • Steering and wheel bearings improperly adjusted
  • Bent or out of balance wheels

Out of Round/Out of Balance

If a tire is laterally or radially O.O.R. by more than 1.2 mm or requires more than 2.5 oz. (71
grams) to balance, this would be considered for warranty if it is within the first .5mm of
tread wear. Other things that can cause imbalance:

  • Tire not seated correctly. Ensure bead guide line is equal distance from wheel all around the tire
  • Make sure wheel is not bent or out of balance – good idea to pre-balance wheel
    assembly and leave those weights on rim. New wheels should not be more than ½ oz (14 grams) out of balance, scratched, or dirty
  • Check wheel is clean – no rust, debris, duct tape
  • Use of proper mounting lubricant

Wear Patterns/Tire Life
  • Cupping can be caused by braking style, bikes equipped with ABS or heavy front
    ends, not enough air, groove pattern or a combination of the above as well as suspension settings and conditions such as road surface
  • Luggage not balanced evenly on bike or mounted hanging over rear end of bike
  • Squaring off on rear – flat, straight roads, high speeds, incorrect air psi
  • Wear on left side of tire can be generated by the longer distance traveled on right side driving roads or bikes such as older BMW’s which can have purposely offset
    wheels, wear on right-riding with one hand on the throttle and body leans slightly
    causing wear on right side
  • Factors governing tire life – load, speed, wheel condition, pressure, riding style,
    wheelspin, ambient temperature, storage, road surface, incorrect brake adjustment or frame/wheel alignment, excessive tolerances on steering head or swingarm bearings, worn dampers