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 What oil temp do you run
Last Post: cal43
Posted On: 26 Minutes Ago
Replies: 136
Views: 34,730
0 Keep & Kill
Last Post: Crusty
Posted On: 45 Minutes Ago
Replies: 29,247
Views: 1,707,558
0 BEST LONG CHROME fILTER FOR 2001 EVO sPORTSTER
Last Post: FiftySixer
Posted On: 1 Hour Ago
Replies: 11
Views: 729
0 Scorpion battery
Last Post: IXL2Relax
Posted On: 1 Hour Ago
Replies: 1
Views: 62
0 How to jumpstart a motorcycle
Last Post: Crusty
Posted On: 1 Hour Ago
Replies: 4
Views: 110
0 Did something silly maybe?
Last Post: ryder rick
Posted On: 1 Hour Ago
Replies: 7
Views: 172
0 Steering stem too short for tapered bearings, convert to balls?
Last Post: ryder rick
Posted On: 1 Hour Ago
Replies: 45
Views: 6,019
0 Hand brake for rear drum
Last Post: ryder rick
Posted On: 1 Hour Ago
Replies: 7
Views: 302
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 36,996
Views: 4,583,658
0 This is gonna hurt.
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 9,602
Views: 2,318,146
0 What did you do for your sporty Today?
Last Post: BKB
Posted On: 2 Hours Ago
Replies: 7,997
Views: 1,451,646
0 Oh deer
Last Post: Nibelungen
Posted On: 2 Hours Ago
Replies: 25
Views: 1,374
0 Food porn
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 2,790
Views: 708,669
0 04-06 metal oil tank
Last Post: BestCoastXL
Posted On: 3 Hours Ago
Replies: 14
Views: 4,621
0 Can't install pushrod cover
Last Post: SHAKY DAVE
Posted On: 4 Hours Ago
Replies: 15
Views: 364
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 8 Hours Ago
Replies: 54,432
Views: 9,257,847
0 6 month old battery discharged and now won't charge at all
Last Post: adri
Posted On: 9 Hours Ago
Replies: 10
Views: 444
0 Short in the turn signals, opened it up, brass fell out?
Last Post: Debute23
Posted On: 10 Hours Ago
Replies: 2
Views: 95
0 2007 1200 low idle when hot...
Last Post: kuch73
Posted On: 10 Hours Ago
Replies: 6
Views: 109
0 Decade Long Project
Last Post: rejeanprimeau
Posted On: 12 Hours Ago
Replies: 45
Views: 5,667
0 pop's through carb at,idle
Last Post: IXL2Relax
Posted On: 15 Hours Ago
Replies: 20
Views: 5,323
0 Coffee serving
Last Post: sportsterpaul
Posted On: 21 Hours Ago
Replies: 2
Views: 205
0 What makes a Hugger a Hugger?
Last Post: BWP 5p
Posted On: 21 Hours Ago
Replies: 11
Views: 302
0 an old Lady
Last Post: Toejam503
Posted On: 23 Hours Ago
Replies: 4
Views: 362
5 Ever Have Days Where You Can't Stand Your Significant Other?
Last Post: Toejam503
Posted On: 23 Hours Ago
Replies: 163
Views: 32,683
0 Amazing without the windshield.
Last Post: rokytnji
Posted On: 23 Hours Ago
Replies: 208
Views: 53,043
0 Gas Cap problem?
Last Post: ZTatZAU
Posted On: 23 Hours Ago
Replies: 60
Views: 2,397
0 Allegheny National Park III
Last Post: sportsterpaul
Posted On: 1 Day Ago
Replies: 194
Views: 20,724
0 video & pics
Last Post: BKB
Posted On: 1 Day Ago
Replies: 1,391
Views: 142,624
0 oil light flickering
Last Post: stewart
Posted On: 1 Day Ago
Replies: 12
Views: 271
More...
Members Birthdays
SoCal 1200N (61), riverar7 (57), rx3732 (48), gnrxl2002 (44)
Reply
 
Share Thread Tools Display Modes
  #1  
Old 4th December 2021
davixlrtt's Avatar
davixlrtt davixlrtt is offline
Chief Harley Engineer
 
Join Date: Nov 2009
Posts: 591
Sportster/Buell Model: 1965 xlch
Sportster/Buell Model #2: 1991 Honda XR600
Other Motorcycle Model: 1986 suzuki gsxr 750.
Reputation: 173179
davixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant future
Default 60’s XLCH front tyre

Hello friends, I’m going to show my ignorance again by asking what’s probably the obvious. I’ve only ever run 4.00X19 front tyres on my bike but now I would like to run a narrower one just to help it drop in better on the turns but it occurred to me that I don’t know the correct size. Specs show 3.25/3.50X19 for 60’s XLCH but does that mean it’s the same tyre but can measure 3.25 or 3.50 depending on what rim or rim width that is being used? I’ll probably be going with a Dunlop K70 and I can get either a 3.25 or a 3.50 in width. So I suppose my question really is, do I buy a 3.25” or a 3.50?
……Davi.
Reply With Quote
  #2  
Old 4th December 2021
Magneto Sportster's Avatar
Magneto Sportster Magneto Sportster is online now
Master Custom Bike Builder
 
Join Date: Jun 2005
Posts: 3,418
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLH
Sportster/Buell Year #2: 1960
Other Motorcycle Model: XLCH
Other Motorcycle Year: 1959
Reputation: 1031270
Magneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond repute
Default

Depends on brand. I find a 3.50-19 Dunlop K70 to be a little too tight in the fender, so I use 3.25-19. But on a bike that I run Avon Speedmaster on, I use 3.50-19 because the 3.25 looks too narrow.
__________________
"Ride 'em, don't hide 'em!"
Reply With Quote
  #3  
Old 4th December 2021
davixlrtt's Avatar
davixlrtt davixlrtt is offline
Chief Harley Engineer
 
Join Date: Nov 2009
Posts: 591
Sportster/Buell Model: 1965 xlch
Sportster/Buell Model #2: 1991 Honda XR600
Other Motorcycle Model: 1986 suzuki gsxr 750.
Reputation: 173179
davixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant futuredavixlrtt has a brilliant future
Default

Hi Magneto, the 4.00 Pirelli MT53 copies I use (Duro) only just about clear the front guard and will rub the braces very slightly under stressful use.
…..Davi.

Last edited by davixlrtt; 5th December 2021 at 01:09.. Reason: Added tyre brand
Reply With Quote
  #4  
Old 5th December 2021
needspeed needspeed is offline
XL FORUM LIFE MEMBER
 
Join Date: May 2014
Posts: 1,707
Sportster/Buell Model: xlh
Sportster/Buell Year: 1974
Reputation: 1276644
needspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond reputeneedspeed has a reputation beyond repute
Default

Quote:
Originally Posted by Magneto Sportster View Post
...Depends on brand..
Indeed, apparently widths vary with brand. It seems that with the old inch measuring system you can't expect the tire width to match the sidewall numbers.

I recently put Continentals on my '74.

Front RB2 3.25-19 on a stock 2.5" width rim measured with calipers = 3.780"

Rear K112 4.00-18 measures 4.560" wide.

So both front and rear measure over a 1/2 inch wider than the sidewall designation.

By the way, I like them alot and the front is a good fit under the fender.
Reply With Quote
  #5  
Old 5th December 2021
Magneto Sportster's Avatar
Magneto Sportster Magneto Sportster is online now
Master Custom Bike Builder
 
Join Date: Jun 2005
Posts: 3,418
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLH
Sportster/Buell Year #2: 1960
Other Motorcycle Model: XLCH
Other Motorcycle Year: 1959
Reputation: 1031270
Magneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond repute
Default

Quote:
Originally Posted by needspeed View Post
Indeed, apparently widths vary with brand. It seems that with the old inch measuring system you can't expect the tire width to match the sidewall numbers.

I recently put Continentals on my '74.

Front RB2 3.25-19 on a stock 2.5" width rim measured with calipers = 3.780"

Rear K112 4.00-18 measures 4.560" wide.

So both front and rear measure over a 1/2 inch wider than the sidewall designation.

By the way, I like them alot and the front is a good fit under the fender.

Agreed - measurements don't seem to mean much to tire manufacturers these days. I bought a pair of Bridgestone BT46's in 3.25-19 and 4.00-18 for my 1969 XLCH this summer before my trip to the Ironhead Rendezvous in Canada. They are so wide that there is no way they will fit the fender on the front and will definitely rub the chain guard on the rear. They are highly recommended tires, but actual measurement is not even close to the size they are being advertised as.
Reply With Quote
  #6  
Old 5th December 2021
83XLX's Avatar
83XLX 83XLX is offline
Senior Master Custom Bike Builder
 
Join Date: Jan 2007
Location: Heart of Dixie
Posts: 8,261
Sportster/Buell Model: XLX-61
Sportster/Buell Year: 1983
Other Motorcycle Model: Honda CL350
Other Motorcycle Year: 1969
Reputation: 1034469
83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute83XLX has a reputation beyond repute
Default

I’m running a 3.50-19 Avon Speedmaster up front, and it fits fine. That said, it’s pretty narrow to be a 3.50 tire. I was going to buy a 3.25-19 Speedmaster, but after measuring the width a 3.50 Avon of the front of a friend’s old Triumph, I knew it would fit my Sportster.
__________________
I never wanted a Harley, but I always wanted a Sportster.

If it ain't broke, don't fix it (especially if you don't know what you're doing). Most Sportster problems are owner-induced.
Reply With Quote
  #7  
Old 7th December 2021
11B40 11B40 is offline
XL FORUM TEAM MEMBER
 
Join Date: Dec 2008
Posts: 1,170
Reputation: 219872
11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future11B40 has a brilliant future
Default

+1 for Avon speedmaster. S&M on the 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 01:32.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC