Best air ppressure for PR4GT - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 48 (permalink) Old 03-31-2017, 12:40 PM Thread Starter
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Best air ppressure for PR4GT

Well the snow is gone and we have a nice day so the new to me 2013 will be taken out. What have you guys been running for air pressure. I weight 150lbs with gear riding solo. How bout with passenger with a total of 320lbs. The front is showing a little cupping now and not to sure how many miles the tire has on it. Total on the bike is 10,700

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post #2 of 48 (permalink) Old 03-31-2017, 01:12 PM
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Most seem to run around 40 lbs front and rear. I'm running the same tire. Check pressure before the ride when cold.
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post #3 of 48 (permalink) Old 03-31-2017, 01:24 PM
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If I'm not mistaken, I run 36 fr and 42 rr
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post #4 of 48 (permalink) Old 03-31-2017, 03:14 PM
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Originally Posted by J-Luv View Post
If I'm not mistaken, I run 36 fr and 42 rr
That's what the Owner's Manual calls for. I started there and bumped the front up to 39. It just feels more secure to me. I can't really say about wear; I just replace sets so I don't worry about front tire life much.

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post #5 of 48 (permalink) Old 03-31-2017, 03:31 PM
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I run 36 front and 42 rear as recommended by Yamaha, for a time they recommended 39 in the front but then went back to 36 - dealer did not know why.

The cupping is caused by use of the front brake and will affect all makes. I tend only to use the front brake in emergencies relying on the rear which is connected to one piston at the front. I get very little cupping and about 9 - 10000 miles. Suprisingly the rear will generally do a couple of thousand more.

I tried the GT version and they did not last as long, so have gone back to the standard ones.

Past bikes; Honda 50 Suzuki 50 Yam XS250 Yam XJ650 Yam XJ 900 Honda CX650 Turbo Yam FJ1100 Yam FJ1200 (2) Honda ST1100 (2) Yam FJR1300 (5) 670,000 miles !

Last edited by lagain; 03-31-2017 at 03:33 PM.
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post #6 of 48 (permalink) Old 03-31-2017, 03:34 PM
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It depends. Are we talking winter air or summer air? As we all know it is best to change your air so it does not get stale. It is also dangerous if you have a leak with the wrong air. I knew a man who had a leak during the winter on a road with high snow banks on either side. The air leaked out of his rear tire but it was Summer Air. It was too warm, it melted all the snow around the bike and the man drowned. I once froze my whole yard over by swapping my winter air out during the summer.





Seriously, this is a matter of personal preference. The PR4s (all of the PRs actually) are going to (take your pick) scallop, cup, deform, warp... over time and mileage. I run 41 Front and 41 Rear. My Dad likes 41 F/42R. I found I had better front end "feel" when I went above the 36 the factory recommends and less scalloping as well.


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post #7 of 48 (permalink) Old 03-31-2017, 05:15 PM
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40 Front, 42 Rear, add 2 psirear loaded up.
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post #8 of 48 (permalink) Old 03-31-2017, 06:18 PM
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Thumbs up As per MFG specs

.
F - 36
r - 42
.

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post #9 of 48 (permalink) Old 03-31-2017, 06:59 PM Thread Starter
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Thanks for all the replies. Seems like it's a 50/50 split between running stock pressures and bumping them up a bit on the front. As far as winter summer air it does not apply to me since I run nitrogen
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post #10 of 48 (permalink) Old 03-31-2017, 07:36 PM
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Best air ppressure for PR4GT

Quote:
Originally Posted by cra-z1 View Post
Thanks for all the replies. As far as winter summer air it does not apply to me since I run nitrogen
cra-z1,

Got some good sources for nitrogen? My air has ~20% oxygen in it, but it's free if you have a compressor.
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