Baffled by PSI Mystery - Road Glide Forums
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post #1 of 9 (permalink) Old 09-25-2018, 09:21 AM Thread Starter
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Baffled by PSI Mystery

Wondering if anyone ever experienced this.

Caught in a hard downpour about two weeks ago, I was heading home and hit a large bump on the road at a bridge joint (pissed me off cuz I know it's there and always avoid it). Immediately after hitting the bump, my TPMS light came on and it showed my front tire had 36 psi and would I like to find air. I was close to home, so dropped my speed. I didn't feel any vibrations, and the PSI showed 35 as I pulled in garage.

My big fear was I bent the rim. I put the bike on the jack and spent the next half hour studying the tire, the rim etc. I didn't see anything. I put the bike on the ground and inflated to 41 PSI. Next morning it was 40 psi, nothing unusual since temps went down overnight. It rained for the next 2 days so bike sat and PSI remained the same.

As a habit, I scroll through my settings before riding for the day. I mentally note the psi, and my front is usually between 41-43 after sitting. It was the same this day.

My question is, is it feasible that a "puff" of air escaped upon impact of the bump without any actual damage? My dealer is stumped, I am stumped, and several hundred miles later, the psi is the same.

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post #2 of 9 (permalink) Old 09-25-2018, 09:30 AM
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Never heard of that happening or do I see how it's possible. May be possible that the pressure was leaking down over time and the bump just happen to wake up the TMPS or it was just a coincidence.

My question is that why is the TMPS alerting you at 36psi when that is the recommended tire pressure for the front anyway? Also, what is the reasoning for running 5-7psi over in the front? Your bike so do what you want but I'm just curious. That's all.

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post #3 of 9 (permalink) Old 09-25-2018, 10:58 AM Thread Starter
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Never heard of that happening or do I see how it's possible. May be possible that the pressure was leaking down over time and the bump just happen to wake up the TMPS or it was just a coincidence.

My question is that why is the TMPS alerting you at 36psi when that is the recommended tire pressure for the front anyway? Also, what is the reasoning for running 5-7psi over in the front? Your bike so do what you want but I'm just curious. That's all.
I have the 18 CVO, 21" front wheel. TPMS light comes on at 40psi. It's been between 42-44 since I picked her up from dealer almost a year ago.

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post #4 of 9 (permalink) Old 09-25-2018, 11:28 AM
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At least you have TPMS! My RGS is a pain in the ass to check rear tire pressure.
Recommended pressures for my bike are 40 R and 36 F.
Is your bike different?

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post #5 of 9 (permalink) Old 09-25-2018, 12:29 PM
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Originally Posted by jchar27 View Post
I have the 18 CVO, 21" front wheel. TPMS light comes on at 40psi. It's been between 42-44 since I picked her up from dealer almost a year ago.

I just looked it up and for a 2018 CVO 21" Front you should be at 36psi and the rear at 40psi cold check just like every other touring model. Nothing is different for tire pressure listed anywhere that I can find.

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post #6 of 9 (permalink) Old 09-25-2018, 01:08 PM
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Sounds like you checked everything out but did you also check your valve stem ?

Make sure that you check your valve stem.

Make sure it's tight and didn't loosen up on you.

If it is not tight, air will escape

Just A Thought And Something Else To Check

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post #7 of 9 (permalink) Old 09-25-2018, 02:44 PM
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$10,000 dollar package upgrade to get $100 TPMS. Thanks Harley.
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post #8 of 9 (permalink) Old 09-25-2018, 03:19 PM
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To loose that much air, it would need to break the bead seal. So it's "possible" to break the bead, loose air, not damage the rim, and seal back up. Sounds like a ONE in a million chance that happened. But that's what it looks like. Let us know of any updates.

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post #9 of 9 (permalink) Old 09-26-2018, 10:27 AM Thread Starter
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To loose that much air, it would need to break the bead seal. So it's "possible" to break the bead, loose air, not damage the rim, and seal back up. Sounds like a ONE in a million chance that happened. But that's what it looks like. Let us know of any updates.

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That's what I was thinking. It seems highly unlikely, but that seems to be the only explanation I can come up with.

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