Short of starting a "tire pressure" war. . . . - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 24 (permalink) Old 05-17-2020, 11:03 PM Thread Starter
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Short of starting a "tire pressure" war. . . .

several months ago, I came to this board and asked y'all what tire pressure you ran in your FJR Generation 2. Understandably, the replies were all over the place. I did average up all of the replies and that input yielded the following: front tire 39.7; rear tire 41.9. As most know, Yamaha recommends 36/42.

Honestly, I did not like Yamaha's tire pressure recommendations, but didn't know what to try. The gentleman who placed the last set of Michelin Pilot Road 4 tires on my FJR raced bikes and he put 34 lbs. in the front and 36 lbs. in the rear. It felt great. I did bump it up to 35 front and 37 rear and love the way my bike feels. FYI men. Try it and you may like it too! Happy trails!
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post #2 of 24 (permalink) Old 05-18-2020, 12:57 AM
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Its not called recommended tire pressure for no reason.

Some front tires such as the RS3 steer too light with anything over 36 PSI. Doesn't feel like it is holding my line over irregularities in the road. T30 and T31 are happy at 39 PSI. A Shinko 016 is a heavy steering pig even at 42 PSI where it skates when turning.

Scalloping (not cupping) occurs when one part of the tire is dragged over the road. This must occur because modern street motorcycle tires are rounded with larger circumference in center than to ether side. The less tire pressure the wider the contact patch and therefore the greater the difference in rolling circumference in contact with road and more scrubbing. This scrubbing is part of the reason there is more rolling resistance with lower tire pressures.

It is your motorcycle, your tires, your tire pressure gauge. Start with Yamaha's recommendation then experiment. All the tires I've seen that fit FJR have maximum cold inflation of 42 PSI. You probably don't want to go over that but on the other hand 42 PSI cold is often 50 PSI hot.

Of late I put 39 PSI cold in my T31 GT front but the other morning it only had 35.8 at 50F. It got over 42 PSI at times during my ride. But have been watching it for weeks and is about time to add 2 PSI.

Oh, with motorcycle TPMS as cheap as $52 you have no excuse not to have one. When a puncture occurs you will see pressure falling many minutes before you feel it.
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post #3 of 24 (permalink) Old 05-18-2020, 02:03 AM
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And remember, tire pressure gauges especially the cheap pencils, read all over the place.

For an inexpensive pencil gauge, I like this:



In the 30 psi to 45 psi range, it closely matches my old, relatively expensive dial gauge that I bought long ago for the air assisted suspension on my GPz750.

When I bought it about 5 years ago, I rounded up all the pencils, six or seven, and checked them all against the dial gauge. I kept the Milton, one of the gauges in my wife's car (she had three), and the gauge that came with my Slime tire compressor. The rest read from about 4 psi low to 5 psi high so I pitched them.


Oh, I run 40 FR/ 42 RR. I started at "recommended" pressure and gradually bumped both up 2 psi until I reached the point where I didn't like how the increase felt, then backed both back.
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Last edited by JohnC; 05-18-2020 at 02:09 AM.
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post #4 of 24 (permalink) Old 05-18-2020, 09:12 AM
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Quote:
Originally Posted by Yamaha4Ever! View Post
several months ago, I came to this board and asked y'all what tire pressure you ran in your FJR Generation 2. Understandably, the replies were all over the place. I did average up all of the replies and that input yielded the following: front tire 39.7; rear tire 41.9. As most know, Yamaha recommends 36/42.

Honestly, I did not like Yamaha's tire pressure recommendations, but didn't know what to try. The gentleman who placed the last set of Michelin Pilot Road 4 tires on my FJR raced bikes and he put 34 lbs. in the front and 36 lbs. in the rear. It felt great. I did bump it up to 35 front and 37 rear and love the way my bike feels. FYI men. Try it and you may like it too! Happy trails!
I think you will find that Yamaha recommends 36/42 PSI on Gen1 bikes, and 39/42 on Gen2/3 bikes.

Also, gentlemen who race bikes generally use bikes that weigh at least 100Kg less than the FJR, and they are more interested in traction than longevity of their tires.

FJR Models owned from new, 2001, 2003, 2006, 2009, 2011, 2014.
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post #5 of 24 (permalink) Old 05-18-2020, 09:29 AM
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A longtime ago it seems when my 14a (the fastestcolor red) was relatively new I complained here about having to wrestle it over into a turn, wasn’t an easy turn-in. And either Liquidsilver or Rayzerman , I really can’t remember suggested increasing the tire pressure a little at a time until it felt neutral going into a turn, 40f-42r was the numbers It felt very neutral on my bike with the oe tires. Wrestle/ force in= pressure to low, falls in = pressure to high.

They also said that if a bike “falls” into a turn to reduce the pressure a bit until it feels neutral again, best tuning advice I’ve ever gotten, it just works !

Also as n4 said above adding a tire pressure monitor is some of the best money you’ll ever spend, use metal valve stems with it though.

I added the $50 amazon system,(can’t remember the brand) and I’ll say the only problem I see is with the constant pressure and temperature display it can make you a bit crazy watching it. I’ll add that if you have the pressure close to ideal the temperature will not fluctuate much, maybe 2-4F but there are a lot of variables that affect it.
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Last edited by passx; 05-18-2020 at 09:32 AM.
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post #6 of 24 (permalink) Old 05-18-2020, 09:55 AM
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The Yammy recommended pressures are for the OEM tires that come on it. BT-023 Bridgestones with stiffy sidewalls and compounds of a certain nature. As soon as you get something else like softer sidewall and compounds (e.g., PR4), you'll want to bump up the pressures a tad.
Racing is done at low pressures to keep the tires hot, likely he's running soft sport bike compounds if he does track days a lot, he'll be wearing them out often. Not applicable to street riding.

I like my bike to turn in without much effort, not worried about "too fast a turn in" whatever that is. I like good feedback, not vague feedback or sluggish turn-in.
All my tire pressures have a 4 as the first digit.... YMMV.
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post #7 of 24 (permalink) Old 05-18-2020, 11:02 AM
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Sounds like one of the Marines' Rules for Gunfighting: "Do not attend a gunfight with a handgun, the caliber of which does not start with a '4'. "
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post #8 of 24 (permalink) Old 05-18-2020, 12:31 PM
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On my PR4GT I started with 36, then tried 37,38,39 40, 41 and 42 running the same 30 mile curvy loop. 40 was the most confidence inspiring for me. Call it neutral or whatever it just went where I intended it to go, and transitioned side to side with little input from me.

of course I have mine lowered 3/8" front and 1/2" on the back which may contribute to that feeling. YMMV

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post #9 of 24 (permalink) Old 05-18-2020, 03:28 PM
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Quote:
Originally Posted by Bernie View Post
I think you will find that Yamaha recommends 36/42 PSI on Gen1 bikes, and 39/42 on Gen2/3 bikes.
2016 is 36/42.

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post #10 of 24 (permalink) Old 05-18-2020, 03:33 PM
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Quote:
Originally Posted by the Ferret View Post
On my PR4GT I started with 36, then tried 37,38,39 40, 41 and 42 running the same 30 mile curvy loop. 40 was the most confidence inspiring for me. Call it neutral or whatever it just went where I intended it to go, and transitioned side to side with little input from me.
After adjusting pressure on the road, what was the tire pressure the next morning? My front usually rises 4 PSI in the first 10 miles.

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