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**antz.bin** · 05-22-2012, 12:50 PM

Thread Approved

**sunilg** · 05-22-2012, 12:59 PM

Most of the weight of the motorcycle and the rider is distributed towards the rear tyre.

also each time you open the throttle, the rear wheel spins much faster than the front tyre as the power from the engine is transferred to the rear tyre. This spinning causes tremendous amount of friction between the rear tyre and the road surface. The tyre loses a little amount of rubber with each cycle. And this results in early wear and tear of the rear tyre as compared to the front.

So you have more puncture in the rear tyre as compared to the front.

**jain.joymax** · 05-22-2012, 01:58 PM

wow..
Thanks for superfast approval...

**julianpaul** · 05-22-2012, 03:45 PM

I've thought about this, and the theory above doesn't quite fit. In most performance bikes, the weight balance is so much forward, there isn't much difference front and back. Also, the front tyre also wears equally hard due to the powerful brakes we have these days.

Here's my theory:

A nail is always lying down on the road. If you gently roll over it, it can't really puncture a tyre. What happens is, first the front wheel goes over it, disturbing it from rest. It will bounce around and rotate in several axes. If, by the time the rear tyre goes over it, it's in a vertical position, with the point upwards, it can penetrate the tyre and cause a puncture. This theory makes sense to me because the rear wheel always follows the front, and usually both wheels would be going over the same nail.

**jain.joymax** · 05-22-2012, 04:06 PM

Originally posted by sunilg View Post

Most of the weight of the motorcycle and the rider is distributed towards the rear tyre.

also each time you open the throttle, the rear wheel spins much faster than the front tyre as the power from the engine is transferred to the rear tyre. This spinning causes tremendous amount of friction between the rear tyre and the road surface. The tyre loses a little amount of rubber with each cycle. And this results in early wear and tear of the rear tyre as compared to the front.

So you have more puncture in the rear tyre as compared to the front.

Originally posted by julianpaul View Post

I've thought about this, and the theory above doesn't quite fit. In most performance bikes, the weight balance is so much forward, there isn't much difference front and back. Also, the front tyre also wears equally hard due to the powerful brakes we have these days.

Here's my theory:

A nail is always lying down on the road. If you gently roll over it, it can't really puncture a tyre. What happens is, first the front wheel goes over it, disturbing it from rest. It will bounce around and rotate in several axes. If, by the time the rear tyre goes over it, it's in a vertical position, with the point upwards, it can penetrate the tyre and cause a puncture. This theory makes sense to me because the rear wheel always follows the front, and usually both wheels would be going over the same nail.

Sunil sir, i wonder wont the engine, the fuel tank, and with a single rider all in front and heavy put more presure on front wheel?

And a nail awlways find the rear tyre but never the front, for which i guess ''julian pauls'' theory explains.

I tried to imagine, and could actully visualise the events of punture as it may happen, and i burstout laughing.

And now i have a Memo on my table.

Lol

**2strokerama** · 05-22-2012, 04:11 PM

^^^
Makes sense until you consider the probability of something like this happening repeatedly. The chance for a nail landing on its sharp side everytime seems incalculable....lets approximate it to a 50\50 chance.

Could make more sense if the puncturing object has multiple sharp sides....say like stones used in construction, or a bunch of brambles.

To me, it seems that it was just his luck that the TS experienced just rear tire punctures.

On the other hand, the rear tire pressure could also be low enough to not offer the puncturing object much resistance. It could also have happened when a pillion or some extra weight was loading the rear tire. Both these combined is a sure way for a puncture.

That said, my most recent puncture was a rear puncture with multiple small nails having pierced the tire. My rear tire pressure was around 30 psi and I was riding by myself.

**saipranav** · 05-22-2012, 04:27 PM

Originally posted by 2strokerama View Post

^^^
Makes sense until you consider the probability of something like this happening repeatedly. The chance for a nail landing on its sharp side everytime seems incalculable....lets approximate it to a 50\50 chance.

Could make more sense if the puncturing object has multiple sharp sides....say like stones used in construction, or a bunch of brambles.

To me, it seems that it was just his luck that the TS experienced just rear tire punctures.

On the other hand, the rear tire pressure could also be low enough to not offer the puncturing object much resistance. It could also have happened when a pillion or some extra weight was loading the rear tire. Both these combined is a sure way for a puncture.

That said, my most recent puncture was a rear puncture with multiple small nails having pierced the tire. My rear tire pressure was around 30 psi and I was riding by myself.

I dont think its just luck, in the last 26k kms, i have had 3 punctures in the rear tyre but none in the front.

**santoosh** · 05-22-2012, 05:18 PM

A bike Without a rider is generally 50/50 weight balanced . Or close to those figures .

With a Rider or rider + pillion the weight distribution is Rear /center on almost all bikes .
Let alone the SBK's with a leaning Posture .

With the added weight , the nail piercing the rear is easier than the front .

Not nail , It may be even a sharp stone ,
Imagine this , Your going over a Speed breaker at 70 kph , The rear lands with a much larger force than the front . So the wear is much more on the rear , Add torque to it and u ll see it ll shed rubber faster.

The fronts generally lasts for eternity.

Also the rear lasts lesser than the Front , It gets weaker much faster and prone to punctures.
Thanks to our people riding with incorrect air pressures too adds to Punctures .
Santa

**jain.joymax** · 05-22-2012, 09:03 PM

Originally posted by saipranav View Post

I dont think its just luck, in the last 26k kms, i have had 3 punctures in the rear tyre but none in the front.

1+ in over 100k kms in past 5 year all hav been rear tyre punctures.

**kaynmantis** · 05-24-2012, 01:30 AM

25k till date. 3 punctures. All happened when tyres were still quiet new I.e. less than 10k. Rear tyre always

. Reason = nails.
Condition of tyre - very good. So this rules out wear and tear. Besides nails wouldn't really care whether tyres are new or old.
Tyre pressure - manufacturer recommended.
Rider - single on all occasion.

There is something to rear tyres after all. Could it be that, front tyre is merely rolling and pushes objects away when they come in contact? While rear tyre does the opposite?

**princesirohi** · 05-24-2012, 03:07 AM

Originally posted by julianpaul View Post

I've thought about this, and the theory above doesn't quite fit. In most performance bikes, the weight balance is so much forward, there isn't much difference front and back. Also, the front tyre also wears equally hard due to the powerful brakes we have these days.

Here's my theory:

A nail is always lying down on the road. If you gently roll over it, it can't really puncture a tyre. What happens is, first the front wheel goes over it, disturbing it from rest. It will bounce around and rotate in several axes. If, by the time the rear tyre goes over it, it's in a vertical position, with the point upwards, it can penetrate the tyre and cause a puncture. This theory makes sense to me because the rear wheel always follows the front, and usually both wheels would be going over the same nail.

julianpaul is right i guess.

Originally posted by santoosh View Post

The fronts generally lasts for eternity.

i beg to differ, it depends on kind of riding, braking type of rubber etc.
my bike's front does not last much longer than rear.

**tbarot** · 06-04-2012, 02:29 PM

Originally posted by julianpaul View Post

I've thought about this, and the theory above doesn't quite fit. In most performance bikes, the weight balance is so much forward, there isn't much difference front and back. Also, the front tyre also wears equally hard due to the powerful brakes we have these days.

Here's my theory:

A nail is always lying down on the road. If you gently roll over it, it can't really puncture a tyre. What happens is, first the front wheel goes over it, disturbing it from rest. It will bounce around and rotate in several axes. If, by the time the rear tyre goes over it, it's in a vertical position, with the point upwards, it can penetrate the tyre and cause a puncture. This theory makes sense to me because the rear wheel always follows the front, and usually both wheels would be going over the same nail.

I totally agree with you, i have done couple of Tests and research on tyre punctures,

your above theory is exactly what i have found, and there is a way to avoid rear tyre punctures, just put a longer front mudflap.
Mudflaps really work and don't let the puncturing object come under the rear wheel. Have you ever driven a car without a mudflap in the front tyres? the possibility of punctures will highly increase!

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Puncture? Why always the rear Tyre?

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