The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Active Threads
0 883 rev range
Last Post: John Harper
Posted On: 1 Minute Ago
Replies: 19
Views: 425
0 This week on Craig's list
Last Post: Maxeffort
Posted On: 29 Minutes Ago
Replies: 5,209
Views: 788,294
0 passenger with driver's backrest
Last Post: Veeflys
Posted On: 30 Minutes Ago
Replies: 4
Views: 86
0 Corona Virus
Last Post: rejeanprimeau
Posted On: 31 Minutes Ago
Replies: 1,609
Views: 156,115
0 Keep & Kill
Last Post: Crusty
Posted On: 31 Minutes Ago
Replies: 21,356
Views: 1,261,505
0 Chain drive vss
Last Post: bustert
Posted On: 40 Minutes Ago
Replies: 1
Views: 61
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 51 Minutes Ago
Replies: 50,331
Views: 8,260,677
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 54 Minutes Ago
Replies: 28,346
Views: 3,010,610
0 yost power tube guy
Last Post: brucstoudt
Posted On: 2 Hours Ago
Replies: 81
Views: 3,887
0 oil filter stuck
Last Post: Bikeaholic
Posted On: 5 Hours Ago
Replies: 10
Views: 240
0 Hammer 1275 clang noise, slow oil feed, kinked crankcase vent.
Last Post: BestCoastXL
Posted On: 6 Hours Ago
Replies: 423
Views: 13,317
0 New Lifters with new cams with your conversion?
Last Post: yelladox
Posted On: 7 Hours Ago
Replies: 6
Views: 365
0 S&S Super E
Last Post: RussW
Posted On: 9 Hours Ago
Replies: 8
Views: 252
0 Sportster Crankcase Pressure / Engine Breathing / Wetsumping and Mods
Last Post: TPEHAK
Posted On: 9 Hours Ago
Replies: 929
Views: 72,179
0 Ia 83 xlx
Last Post: sportsterpaul
Posted On: 9 Hours Ago
Replies: 8
Views: 143
0 is a buell a harley
Last Post: Iron Mike
Posted On: 9 Hours Ago
Replies: 176
Views: 30,062
0 Hawkeye's 1275 Hammer Performance Conversion
Last Post: hexnut
Posted On: 11 Hours Ago
Replies: 74
Views: 5,935
0 Peanut, 3.3 or 4.5 gas tank ?
Last Post: IXL2Relax
Posted On: 11 Hours Ago
Replies: 261
Views: 79,063
0 how to reduce buffering
Last Post: Stude
Posted On: 11 Hours Ago
Replies: 8
Views: 412
0 Sidehack for XLS
Last Post: mikethebike61
Posted On: 12 Hours Ago
Replies: 72
Views: 6,075
0 1986-90 Evo Sportsters: What every owner should know but were afraid to ask
Last Post: Hippysmack
Posted On: 14 Hours Ago
Replies: 459
Views: 76,901
0 Proper XLCH
Last Post: revjen45
Posted On: 14 Hours Ago
Replies: 118
Views: 21,594
5 Poll: Milwaukee-Eight Sportster Engine Size
Last Post: Steve9
Posted On: 14 Hours Ago
Replies: 31
Views: 2,628
0 73 xlch gas flowing from carb
Last Post: sungod
Posted On: 14 Hours Ago
Replies: 8
Views: 310
0 Shovster build take2
Last Post: kitabel
Posted On: 15 Hours Ago
Replies: 193
Views: 15,646
0 Iron 1966 XLRTT
Last Post: Ferrous Head
Posted On: 17 Hours Ago
Replies: 167
Views: 40,942
0 Poll: If you had to have a stock sporty, what would it be?
Last Post: xlerate
Posted On: 17 Hours Ago
Replies: 611
Views: 206,170
0 Your Favorite Style
Last Post: AZbiker
Posted On: 17 Hours Ago
Replies: 503
Views: 219,383
0 Was your 1st bike a Sportster?
Last Post: Marsikus
Posted On: 17 Hours Ago
Replies: 1,049
Views: 278,734
0 1983 Ironhead - Oil not Returning
Last Post: Hippysmack
Posted On: 19 Hours Ago
Replies: 38
Views: 2,360
More...
Members Birthdays
Tags
79 ironhead sportster, tire pressure

Reply
 
Share Thread Tools Display Modes
  #1  
Old 26th February 2021
ThenCameHarry's Avatar
ThenCameHarry ThenCameHarry is offline
Greasemonkey
 
Join Date: Jun 2014
Posts: 100
Sportster/Buell Model: XLS
Sportster/Buell Year: 2013
Sportster/Buell Model #2: XLS
Sportster/Buell Year #2: 1999
Other Motorcycle Model: Ironhead XLH
Other Motorcycle Year: 1979
ThenCameHarry has disabled reputation
Default Tire Pressure 1979 XLH

I am just about finished with the restoration of one of my two 1979 Ironheads.

Both bikes have cast wheels.

A few years ago I had installed the following brand new tires:

Front:
Dunlop RS-310F tubeless 100/90-19, max load is 507 lbs
@ 41 PSI cold.

Rear:
Dunlop RS-310R tubeless 120/90-18, max load is 632 lbs
@ 41 PSI cold.

The manual calls for pressures of 26 PSI front and 32 PSI rear.

Of course that was for the tires used back then which, I seem to recall were Goodyear.

Given the above data should I use the factory recommended tire pressures 26F/32R or should I go somewhat higher like 30F/36R

I will ride without a passenger, not loaded and I weigh around 180 pounds.

I realize that I could just use a certain pressure and wait for a while to see how they wear.

Well I will be definitely doing that. But I’d like to start off with the best guess possible.

Thanks for your thoughts on this.

Harry.

Last edited by ThenCameHarry; 26th February 2021 at 23:26.. Reason: Correction of load number
Reply With Quote
  #2  
Old 27th February 2021
doodah man's Avatar
doodah man doodah man is offline
Senior Master Custom Bike Builder
 
Join Date: May 2009
Location: 37° 25' 28" N by -80° 03' 42" W
Posts: 11,069
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1975
Reputation: 883977
doodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond reputedoodah man has a reputation beyond repute
Default

I've always kept 35psi front and rear. No issues.
__________________
"when you don't know where you're going, any road'll take you there"
Reply With Quote
  #3  
Old 27th February 2021
ThenCameHarry's Avatar
ThenCameHarry ThenCameHarry is offline
Greasemonkey
 
Join Date: Jun 2014
Posts: 100
Sportster/Buell Model: XLS
Sportster/Buell Year: 2013
Sportster/Buell Model #2: XLS
Sportster/Buell Year #2: 1999
Other Motorcycle Model: Ironhead XLH
Other Motorcycle Year: 1979
ThenCameHarry has disabled reputation
Default

Quote:
Originally Posted by doodah man View Post
I've always kept 35psi front and rear. No issues.
Thanks much for your feedback.
Reply With Quote
  #4  
Old 27th February 2021
bustert's Avatar
bustert bustert is offline
XL FORUM TEAM MEMBER
 
Join Date: Jul 2008
Posts: 10,337
Sportster/Buell Model: 1200s
Sportster/Buell Year: 2001
Sportster/Buell Model #2: xlch
Sportster/Buell Year #2: 1974
Reputation: 3292953
bustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond reputebustert has a reputation beyond repute
Default

more than comfort and wear is here. a lot depends upon the tire and rim. being cast, i think there is no concern. but the tire profile does make a diff. i hate the so called sport or mushroom tires and they do call for more pressure if you are into the twisties. but that comes at a cost, the 2" contact patch down the middle will wear quickly. i have smoked them in under 4k miles. i like the flat profile like the commander tire with 4" contact patch. yep, more road feel and effort needed for the twisties but predictable, not the fall off the center feel. on the sport tire, i can break traction at 70mph. i think mr. doo suggestion is right, middle of the road approach. personally, i ride what the tire calls for but i ride diff than most.
Reply With Quote
  #5  
Old 27th February 2021
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
Blind Owl
 
Join Date: Jun 2009
Location: Sunshine Coast
Posts: 6,465
Sportster/Buell Model: XLB, XLCH, Sporton
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1966
Other Motorcycle Model: XLCH (Another one)
Other Motorcycle Year: 1966
Reputation: 1866965
Ferrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond reputeFerrous Head has a reputation beyond repute
Default

Manual air pressure figures are for GoodYear Tires from back then. Use the manufacturers recommended pressures. Tires work in a "heat range" and that will depend greatly on inflation pressure which affects sidewall flex.
Too cold or too hot, either way reduces grip.
__________________
"I know only too well the evil that I propose. But my inclinations get the better of me."
Reply With Quote
  #6  
Old 27th February 2021
Scuba10jdl's Avatar
Scuba10jdl Scuba10jdl is offline
Senior Chief Harley Engineer 1st Class
 
Join Date: Dec 2010
Location: Columbus, Ohio
Posts: 1,394
Sportster/Buell Model: XLH883/1250
Sportster/Buell Year: 2002
Sportster/Buell Model #2: XLCH 1000
Sportster/Buell Year #2: 1972
Reputation: 549790
Scuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond reputeScuba10jdl has a reputation beyond repute
Default

Modern Sporties with modern tires run 30F/36R. Ironheads being a tad lighter can go down a smidge, but I run mine at that and they do fine (Shinko 777, 100/90-19 front and 130/90-16 rear) when checked while hot.

You want to run the cold psi so that when you get it hot after riding you see about a 10% increase. If it didn't increase enough, the cold pressure is too high. If it increases too much, the cold psi is too low.
__________________
[IMG]http://i.imgur.com/Oe4Ttw0.png[/IMG][IMG]https://i.imgur.com/AFv3AMo.jpg?1[/IMG]
2002 XLH883/HAMMER1250 - 1972 XLCH 1000 - Few things in life are as satisfying as riding a Sportster with no destination in mind.
Reply With Quote
  #7  
Old 28th February 2021
ThenCameHarry's Avatar
ThenCameHarry ThenCameHarry is offline
Greasemonkey
 
Join Date: Jun 2014
Posts: 100
Sportster/Buell Model: XLS
Sportster/Buell Year: 2013
Sportster/Buell Model #2: XLS
Sportster/Buell Year #2: 1999
Other Motorcycle Model: Ironhead XLH
Other Motorcycle Year: 1979
ThenCameHarry has disabled reputation
Default

Scuba10jdl,
Thanks for the substantial information on the different tires and pressures.
Much appreciated.
Harry
Reply With Quote
  #8  
Old 28th February 2021
ThenCameHarry's Avatar
ThenCameHarry ThenCameHarry is offline
Greasemonkey
 
Join Date: Jun 2014
Posts: 100
Sportster/Buell Model: XLS
Sportster/Buell Year: 2013
Sportster/Buell Model #2: XLS
Sportster/Buell Year #2: 1999
Other Motorcycle Model: Ironhead XLH
Other Motorcycle Year: 1979
ThenCameHarry has disabled reputation
Default

Quote:
Originally Posted by Ferrous Head View Post
Manual air pressure figures are for GoodYear Tires from back then. Use the manufacturers recommended pressures. Tires work in a "heat range" and that will depend greatly on inflation pressure which affects sidewall flex.
Too cold or too hot, either way reduces grip.
Thanks so much for your reply.
What you are saying makes perfectly sense and agrees with what I seem to recall about tires on Ironheads of that era. But since it’s been over 35 years that I rode my last Ironhead, I just wanted to make sure.
The tires I have now are 41 psi cold front and rear. With that in mind it sounds like I should just run them from around 35 psi.
Thanks again.
Harry.
Reply With Quote
  #9  
Old 28th February 2021
paulc paulc is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2013
Location: East Midlands UK
Posts: 1,813
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1976
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 74/5
Reputation: 1066518
paulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond reputepaulc has a reputation beyond repute
Default

Modern tyres do seem to run higher pressures. I have Avon Roadriders on my 76 and use 40psi rear, 30 psi front. Simply because the guy at the bike tyre place who fitted them suggested it and it seems fine so I stick with that.
Paul
__________________
Reply With Quote
  #10  
Old 28th February 2021
1Scooter 1Scooter is offline
Master Mechanic
 
Join Date: Jun 2016
Posts: 285
Sportster/Buell Model: XLH1000
Sportster/Buell Year: 1977
Sportster/Buell Model #2: 2004 XLH1200Custom
Other Motorcycle Model: 2007 FXDB
Other Motorcycle Year: 2004
Reputation: 58648
1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold1Scooter is a splendid one to behold
Default

Ya got modern tires on an old bike. On my 77, 30 front & 36 rear.
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT +1. The time now is 13:00.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC