2021 TPMS Question.
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Seasoned HDF Member
Joined: Apr 2015
Posts: 6,863
Likes: 3,727
From: St. Charles, MO
2021 TPMS Question.
Just got back from Sturgis. GREAT trip!
On the way home, second to last stop, my TPMS triggers and says my rear tire is "low". Running hot at 45 psi. I'm thinking "huh? that's not low!", so I ignore it until I get home.
I let the tires cool, and my front tire drops to 35, my rear to 40 - almost precisely where the manual says to keep them. Fire up the bike and now the TPMS says BOTH are low! Air up the tires to 40/46 - TPMS goes quiet. Until I get up a ride it a bit, now the rear tire says "HI"! Is there a setting somewhere for a window of alerts? What are the limits of the TPMS? At what point does it trigger "low"? Surely not 45 psi in the rear, and yet...
On the way home, second to last stop, my TPMS triggers and says my rear tire is "low". Running hot at 45 psi. I'm thinking "huh? that's not low!", so I ignore it until I get home.
I let the tires cool, and my front tire drops to 35, my rear to 40 - almost precisely where the manual says to keep them. Fire up the bike and now the TPMS says BOTH are low! Air up the tires to 40/46 - TPMS goes quiet. Until I get up a ride it a bit, now the rear tire says "HI"! Is there a setting somewhere for a window of alerts? What are the limits of the TPMS? At what point does it trigger "low"? Surely not 45 psi in the rear, and yet...
Stellar HDF Member
Joined: Jun 2017
Posts: 2,325
Likes: 1,153
From: Oklahoma
I'm new to the HD TPMS (installed about a month), but so far I have seen my tires commonly warm up to 44-45 front and 47-49 rear and have yet to get a "dummy light" or a high alert. I run mine cold at 38-40 front & 40 rear. I've read on forum(s) that low pressure warning activates at 3psi lower than what the factory set cold press recommendation is... but I have now idea, yet, what that trigger's actual psi is. I have read nothing as to what the high trigger is...
I have had TPMS systems on this bike for years, originally using an aftermarket in-tire system (Orange Electronics). With it I would regularly see the back tire heat up to 49psi in the summer running down the highway (it would also show tire temps which were interesting, but I can't remember what those would run at). So the HD sensors seem in line with that. I will be heading out soon on a road trip, probably similar to the one you just finished, so there will be some cool mornings and hot afternoons and I am expecting to "learn" a bit about this system lol we'll see...
I have been told... so who knows if its accurate, that the "thresholds are factory set" and can't be tweaked... but I was also told that you couldn't put HD's TPMS in my year model bike...
I can see the pressures, so thats cool... just have to deal with what it throws at me lol
If you find out that they (a HD dealer or whoever) can tweak those thresholds, or even accurately what they are, let us know please!
I have had TPMS systems on this bike for years, originally using an aftermarket in-tire system (Orange Electronics). With it I would regularly see the back tire heat up to 49psi in the summer running down the highway (it would also show tire temps which were interesting, but I can't remember what those would run at). So the HD sensors seem in line with that. I will be heading out soon on a road trip, probably similar to the one you just finished, so there will be some cool mornings and hot afternoons and I am expecting to "learn" a bit about this system lol we'll see...
I have been told... so who knows if its accurate, that the "thresholds are factory set" and can't be tweaked... but I was also told that you couldn't put HD's TPMS in my year model bike...
I can see the pressures, so thats cool... just have to deal with what it throws at me lol
If you find out that they (a HD dealer or whoever) can tweak those thresholds, or even accurately what they are, let us know please!
Seasoned HDF Member
Joined: Sep 2018
Posts: 6,040
Likes: 1,816
From: Kalifornia
I'm new to the HD TPMS (installed about a month), but so far I have seen my tires commonly warm up to 44-45 front and 47-49 rear and have yet to get a "dummy light" or a high alert. I run mine cold at 38-40 front & 40 rear. I've read on forum(s) that low pressure warning activates at 3psi lower than what the factory set cold press recommendation is... but I have now idea, yet, what that trigger's actual psi is. I have read nothing as to what the high trigger is...
I have had TPMS systems on this bike for years, originally using an aftermarket in-tire system (Orange Electronics). With it I would regularly see the back tire heat up to 49psi in the summer running down the highway (it would also show tire temps which were interesting, but I can't remember what those would run at). So the HD sensors seem in line with that. I will be heading out soon on a road trip, probably similar to the one you just finished, so there will be some cool mornings and hot afternoons and I am expecting to "learn" a bit about this system lol we'll see...
I have been told... so who knows if its accurate, that the "thresholds are factory set" and can't be tweaked... but I was also told that you couldn't put HD's TPMS in my year model bike...
I can see the pressures, so thats cool... just have to deal with what it throws at me lol
If you find out that they (a HD dealer or whoever) can tweak those thresholds, or even accurately what they are, let us know please!
I have had TPMS systems on this bike for years, originally using an aftermarket in-tire system (Orange Electronics). With it I would regularly see the back tire heat up to 49psi in the summer running down the highway (it would also show tire temps which were interesting, but I can't remember what those would run at). So the HD sensors seem in line with that. I will be heading out soon on a road trip, probably similar to the one you just finished, so there will be some cool mornings and hot afternoons and I am expecting to "learn" a bit about this system lol we'll see...
I have been told... so who knows if its accurate, that the "thresholds are factory set" and can't be tweaked... but I was also told that you couldn't put HD's TPMS in my year model bike...
I can see the pressures, so thats cool... just have to deal with what it throws at me lol
If you find out that they (a HD dealer or whoever) can tweak those thresholds, or even accurately what they are, let us know please!
Cruiser
Joined: Dec 2020
Posts: 244
Likes: 280
From: Las Vegas
My buddy just ran into the same issue last week on his 2020 Street glide. Our local dealer said they've been having a lot of bikes come in with the same issue. They said Harley's fix is to let out at least 5 psi and then refill the tires back to proper operating temperature. You must let out at least 5PSI or more. That's what we did on his bike and it worked.
Stellar HDF Member
Joined: Jun 2017
Posts: 2,325
Likes: 1,153
From: Oklahoma
What do you want to know? lol
Post #159 I start with everything I did, which was basically what the people on the 16 pages before me did over two years. I did try to consolidate some of the info from earlier in that thread, and clear up some of the information.
https://www.hdforums.com/forum/milwa...1-tpms-16.html
If you're interested for your Ultra Classic and if it has security on it and a GT6.5 then your replacement BCM is the same as mine (if you don't have security then yours has a different replacement BCM that I know nothing about, and you need a GT6.5 or a GTS so you can get a display there). If your has that... then to get it where you have TPMS displaying on your radio (and it will send a pop up on low pressure to it too) then a new BCM (41000341F) $180 , valve stems/sensors (42300124A) $200, probably going to need a couple rubber bushings to make the TPMS valve stems fit tight in those stock rims if they have the 11.4mm hole (I used the ones off a FOBO valve stem set I had)$10.... then its just finding a dealer to program it for you and that sometimes is the real trick. Or find a Indy with Diag4Bike to do it.
If you also want the "Dummy Light" on the tach and the front and rear pressure on the speedo's LCD screen (so you can page thru it using the trigger button and its added to the screen on the speedo with Trip a, Trip B, etc) then you'll have to switch out gauges too, but you don't have to do this if you don't want and if having it on the stereo is enough... otherwise the Speedo/Tac is $350 and the Volt & Fuel gauges are $100 each.
Post #159 I start with everything I did, which was basically what the people on the 16 pages before me did over two years. I did try to consolidate some of the info from earlier in that thread, and clear up some of the information.
https://www.hdforums.com/forum/milwa...1-tpms-16.html
If you're interested for your Ultra Classic and if it has security on it and a GT6.5 then your replacement BCM is the same as mine (if you don't have security then yours has a different replacement BCM that I know nothing about, and you need a GT6.5 or a GTS so you can get a display there). If your has that... then to get it where you have TPMS displaying on your radio (and it will send a pop up on low pressure to it too) then a new BCM (41000341F) $180 , valve stems/sensors (42300124A) $200, probably going to need a couple rubber bushings to make the TPMS valve stems fit tight in those stock rims if they have the 11.4mm hole (I used the ones off a FOBO valve stem set I had)$10.... then its just finding a dealer to program it for you and that sometimes is the real trick. Or find a Indy with Diag4Bike to do it.
If you also want the "Dummy Light" on the tach and the front and rear pressure on the speedo's LCD screen (so you can page thru it using the trigger button and its added to the screen on the speedo with Trip a, Trip B, etc) then you'll have to switch out gauges too, but you don't have to do this if you don't want and if having it on the stereo is enough... otherwise the Speedo/Tac is $350 and the Volt & Fuel gauges are $100 each.
Last edited by Ssitruc; Aug 23, 2021 at 08:49 PM.
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Seasoned HDF Member
Joined: Sep 2018
Posts: 6,040
Likes: 1,816
From: Kalifornia
What do you want to know? lol
Post #159 I start with everything I did, which was basically what the people on the 16 pages before me did over two years. I did try to consolidate some of the info from earlier in that thread, and clear up some of the information.
https://www.hdforums.com/forum/milwa...1-tpms-16.html
If you're interested for your Ultra Classic and if it has security on it and a GT6.5 then your replacement BCM is the same as mine (if you don't have security then yours has a different replacement BCM that I know nothing about, and you need a GT6.5 or a GTS so you can get a display there). If your has that... then to get it where you have TPMS displaying on your radio (and it will send a pop up on low pressure to it too) then a new BCM (41000341F) $180 , valve stems/sensors (42300124A) $200, probably going to need a couple rubber bushings to make the TPMS valve stems fit tight in those stock rims if they have the 11.4mm hole (I used the ones off a FOBO valve stem set I had)$10.... then its just finding a dealer to program it for you and that sometimes is the real trick. Or find a Indy with Diag4Bike to do it.
If you also want the "Dummy Light" on the tach and the front and rear pressure on the speedo's LCD screen (so you can page thru it using the trigger button and its added to the screen on the speedo with Trip a, Trip B, etc) then you'll have to switch out gauges too, but you don't have to do this if you don't want and if having it on the stereo is enough... otherwise the Speedo/Tac is $350 and the Volt & Fuel gauges are $100 each.
Post #159 I start with everything I did, which was basically what the people on the 16 pages before me did over two years. I did try to consolidate some of the info from earlier in that thread, and clear up some of the information.
https://www.hdforums.com/forum/milwa...1-tpms-16.html
If you're interested for your Ultra Classic and if it has security on it and a GT6.5 then your replacement BCM is the same as mine (if you don't have security then yours has a different replacement BCM that I know nothing about, and you need a GT6.5 or a GTS so you can get a display there). If your has that... then to get it where you have TPMS displaying on your radio (and it will send a pop up on low pressure to it too) then a new BCM (41000341F) $180 , valve stems/sensors (42300124A) $200, probably going to need a couple rubber bushings to make the TPMS valve stems fit tight in those stock rims if they have the 11.4mm hole (I used the ones off a FOBO valve stem set I had)$10.... then its just finding a dealer to program it for you and that sometimes is the real trick. Or find a Indy with Diag4Bike to do it.
If you also want the "Dummy Light" on the tach and the front and rear pressure on the speedo's LCD screen (so you can page thru it using the trigger button and its added to the screen on the speedo with Trip a, Trip B, etc) then you'll have to switch out gauges too, but you don't have to do this if you don't want and if having it on the stereo is enough... otherwise the Speedo/Tac is $350 and the Volt & Fuel gauges are $100 each.
Cool, thanks. Yes I have the 6.5 GT and security system. I THINK I would be fine with seeing it onscreen, but thats a later decision. I will review your post, and others. I had missed that somehow. I had an aftermarket one on there and recently removed and trashed it.
Will the bike run, with a new bcm installed, but not programmed by the dealer? Is the programming JUST to recognize the new tpms?
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Stellar HDF Member
Joined: Jun 2017
Posts: 2,325
Likes: 1,153
From: Oklahoma
Cool, thanks. Yes I have the 6.5 GT and security system. I THINK I would be fine with seeing it onscreen, but thats a later decision. I will review your post, and others. I had missed that somehow. I had an aftermarket one on there and recently removed and trashed it.
Will the bike run, with a new bcm installed, but not programmed by the dealer? Is the programming JUST to recognize the new tpms?
Will the bike run, with a new bcm installed, but not programmed by the dealer? Is the programming JUST to recognize the new tpms?
You could have the BCM changed out and programmed to the new one, and just not enable any of the TPMS stuff till you're ready, and have that out of the way... then the next thing is adding the valve stem/sensors. Getting them in the wheels cause people to get anxious or whatever getting that done because HD's TPMS valves stems are made for 8.3mm holes, a lot of the non-CVO factory wheels have 11.4mm holes (1/8" bigger) Thats what the talk about the FOBO bushing is about... They are "universal fit" valve stems that we robbed just the bushing off of, and put on these HD ones to make them fit tight in a 11.4mm hole... thats all.
Also... honestly, I changed out gauges while I was at it, and it is cool, but it is sooo not needed for this, the TPMS screen on the radio is plenty (plus you save $350-$550 not buying gauges lol).
See post #171 in that thread I link up above (talks about using the fobo bushing)