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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 59.57%
Go by the Max. air pressure on the tire 5 10.64%
Adjust pressure to my style of riding 14 29.79%
Only add air when tires look or feel low 0 0%
Voters: 47. You may not vote on this poll

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  #51  
Old 25th January 2021
shanneba shanneba is offline
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I see for 2021 HD has added a tire air pressure "adjustment" to the listed cold tire pressures based on ambient air temp for both before and after riding.

AMBIENT AIR
TEMPERATURE
MOTORCYCLE NOT RIDDEN FOR 2 HOURS OR MORE: ADD TO FRONT AND REAR PRESSURES IN TABLE
20 C (68 F) or less 0 kPa (0 psi)
26 C (79 F) 7 kPa (1 psi)
31 C (88 F) 14 kPa (2 psi)
37 C (99 F) 21 kPa (3 psi)
42 C (108 F) or higher- 28 kPa (4 psi)

MOTORCYCLE RECENTLY RIDDEN: ADD TO FRONT AND REAR PRESSURES IN TABLE
20 C (68 F) or less 34 kPa (5 psi)
26 C (79 F) 41 kPa (6 psi)
31 C (88 F) 48 kPa (7 psi)
37 C (99 F) 55 kPa (8 psi)
42 C (108 F) or higher- 62 kPa (9 psi)


2021 HARLEY-DAVIDSON OWNER'S MANUAL: SPORTSTER MODELS
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  #52  
Old 25th January 2021
Bone's Avatar
Bone Bone is offline
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Quote:
Originally Posted by shanneba View Post
I see for 2021 HD has added a tire air pressure "adjustment" to the listed cold tire pressures based on ambient air temp for both before and after riding.



AMBIENT AIR

TEMPERATURE

MOTORCYCLE NOT RIDDEN FOR 2 HOURS OR MORE: ADD TO FRONT AND REAR PRESSURES IN TABLE

20 C (68 F) or less 0 kPa (0 psi)

26 C (79 F) 7 kPa (1 psi)

31 C (88 F) 14 kPa (2 psi)

37 C (99 F) 21 kPa (3 psi)

42 C (108 F) or higher- 28 kPa (4 psi)



MOTORCYCLE RECENTLY RIDDEN: ADD TO FRONT AND REAR PRESSURES IN TABLE

20 C (68 F) or less 34 kPa (5 psi)

26 C (79 F) 41 kPa (6 psi)

31 C (88 F) 48 kPa (7 psi)

37 C (99 F) 55 kPa (8 psi)

42 C (108 F) or higher- 62 kPa (9 psi)





2021 HARLEY-DAVIDSON OWNER'S MANUAL: SPORTSTER MODELS

Nice, good info and a smarter way to approach it.
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  #53  
Old 25th January 2021
Tomcatt Tomcatt is offline
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Starting ("cold") pressures change 1 psi per 10 F change in ambient air temp
Hot ("after ride") pressures should be starting pressure + 5 psi.
You adjust starting pressure to get that 5 psi rise.
Higher starting pressures result in less rise.
Lower starting pressures result in more rise.
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