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Old 3rd August 2007, 17:40   #1
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Default What tyre pressure to maintain? (for bikes)

I recently upgraded the tyres on my bike

(Front) 2.75/18 to 3.00/18 MRF Zapper
(Rear) 3.00/18 to 120/18 MRF Zapper Q

I have also changed the stock rims to alloys. Didn't have to do any major alterations to squeeze in the wider tyres except removing the chain guard.
(Will post some pics later)

The stability and road-grip and have definitely improved (Got stuck in rain for a couple of days this week and did not find any issues even on hard braking).
No noticeable difference in the pick up either
Will comment on the FE once I figure that out
All in all, I am quite happy with the change

Now what I want to know is that, what tyre pressure to maintain in these tyres? The dealer suggested 45 for the rear and 32-35 for the front. Is this correct?
In fact, I would like to know how to determine the optimum pressure for any particular tyre.
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Old 4th August 2007, 22:48   #2
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that seems to be a high value. i have a p150 dts-i with stock tyres and the manual specifies 32 for rear and 25 for the front tyre.
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Old 5th August 2007, 16:10   #3
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@Hyper, see that I have changed the stock tyres. Hence the confusion.
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Old 7th August 2007, 17:28   #4
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What is this guys, 3 days and just one reply? Please help me out here...

@Mods, I guess changing the thread name to "Tyre pressure for Wider Tyres (for bikes)" Might help.
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Old 8th August 2007, 17:48   #5
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Quote:
Originally Posted by Jaguar View Post
@Hyper, see that I have changed the stock tyres. Hence the confusion.
34 PSI is enough !!!
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Old 8th August 2007, 20:20   #6
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Check this

MRF Exports | Tyres | Two / Three - Wheeler - Zapper Q
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Old 11th August 2007, 12:45   #7
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even though u have wider tyres, the change in tyre pressure will never be that high..
check ur tyre sidewall, there might be something which indicates the maximum pressure that you can inflate it to..
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Old 24th August 2007, 21:02   #8
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I think you should go for 38 - 28 combination. Yoy ar'nt facing any problem with the grip so this one would be fine for you. You can afford to go for even 38 for the rear, your grip would improve but at the cost of tyre wear..
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Old 28th August 2007, 20:54   #9
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I maintain 2.75 x18 - 25psi in front and 100/90 x18 - 32psi in rear
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Old 28th August 2007, 22:15   #10
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I run 3.00 X 18 at 27-28 psi and 100/90 R18 at around 32-24 psi. What you dealer recommended is too much.
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Old 28th August 2007, 23:08   #11
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maintain 25psi up front and 29psi @ the rear when single and 25psi up front and 30psi@ the rear while riding doubles.. for a stock 18"rim and a 100/90 tyre.

that's what the 99' CBZ manual says..

Cheers
Shrey
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