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Sportster Motorcycle Tires, Wheels, and Brakes Discuss issues with Sportster motorcycle tires, wheels and brakes.

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View Poll Results: How do you adjust your tire pressures?
Use Manufacturers recommendations 28 58.33%
Go by the Max. air pressure on the tire 5 10.42%
Adjust pressure to my style of riding 15 31.25%
Only add air when tires look or feel low 0 0%
Voters: 48. You may not vote on this poll

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  #11  
Old 25th July 2019
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When I recently dyno'd my bike at the local dealer, they set my tire pressure according to their specs which is 30psi front, 40psi rear cold to avoid obviously blowing my rear due to the heat and high speed of the dyno.
Tire manufacturer says 40psi front and I think 45psi rear.
These are stock Dunlops.

Now these are for max load which I am not.
That said, I run 26psi front and 35psi rear or slightly lower than vehicle specs.

Last edited by 60Gunner; 26th July 2019 at 17:48..
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  #12  
Old 26th July 2019
SLW210 SLW210 is offline
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With the Michelin Commander IIs I am +2 front and back from what is in the manual and on the frame. The stock Dunlops that were on it I ran +4 Front and +2 rear.

I weigh right at 185 lbs ready to ride, I have heard Harley (and most motorcycle companies/tire companies) use a 180 lbs rider for their pressure recommendations.

The Manual for my 2009 is 30psi front and 36psi rear (solo) 40 psi Rear (two up).

The manual is not at all correct on the 21" rim with the stock tire, 30psi will get you killed IMHO.
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  #13  
Old 26th July 2019
Will1250 Will1250 is offline
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The above '4 PSI rule' will help set your tyre pressures for your particular riding style, loading and other variable circumstances (hot sea level dessert as opposed to cold weather mountains, for an instance, where the manufacturer's recommendation would not be appropriate).

This particular pic is taken from the Cooper Tyre company, but there are others.

Hope this helps,
Cheers, Will
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  #14  
Old 26th July 2019
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Quote:
Originally Posted by SLW210 View Post
The manual is not at all correct on the 21" rim with the stock tire, 30psi will get you killed IMHO.
Blimey! I ran that tyre on that rim for years (on two different bikes), and always at 30 psi. Never had a problem.
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  #15  
Old 26th July 2019
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grrrrrrrrrrrr can´t see any pics???? link to the webpage where the tables are shown??

Thanks.
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  #16  
Old 26th July 2019
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Quote:
Originally Posted by Folkie View Post
Blimey! I ran that tyre on that rim for years (on two different bikes), and always at 30 psi. Never had a problem.
I actually saw quite a few complaints on the internet, not hard to find. That's how I figured out to add more air. It basically only helped, the stock Dunlop is skinny and has a groove down the middle, which has some drawbacks on the roads over here. Going to the Michelin helped a bunch, but it is still a skinny tire. On fairly nice roads it is not noticeable, I can really tell the difference going back and forth to the FXLR with the wider front tire compared to the Sportster now as well.

I never put the bike down, but adding 4psi, did a lot to improve overall handling and the effort, at factory recommended pressure, grooves, tar snakes, etc. would really give you a workout, compared to airing it up.

It's amazing what you can get used too until you compare it to something else. I remember being used to drum brakes front and back, I would probably die using those now.
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  #17  
Old 26th July 2019
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The 21" tire I took off my bike had 10200 miles on it. I ran 30psi over it's life span and questioned whether I needed to replace it or not, it still had 4/32's in the center and no cupping or feather marks. I changed it because the rubber seemed a lot harder than when new and had ever so tiny weather checks between the treads. In the past I have tried running around 35 psi and noticed the tire was prone to sliding when I would came to a full stop. Discussing this with a few fellow riders, all agreed that if you stay with the brand of tire the bike came with, running the recommended psi was the best option. But most agreed that changing tire brands and tread patterns would also mean you would need to experiment with tire pressures.
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  #18  
Old 26th July 2019
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Like I said, I dont even run 30.
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  #19  
Old 26th July 2019
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I only run 22 psi in my other bike.
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  #20  
Old 26th July 2019
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I lowered mine to 24 yesterday. I noticed the center is wearing more. Besides being lighter than 180lbs., the stance of my bike takes the weight off the front more than stock. The rear is at 34.
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