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

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  #1  
Old 4th December 2021
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davixlrtt davixlrtt is offline
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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?
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  #2  
Old 4th December 2021
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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.
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  #3  
Old 4th December 2021
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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 02:09.. Reason: Added tyre brand
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Old 5th December 2021
needspeed needspeed is offline
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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.
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Old 5th December 2021
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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.
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Old 5th December 2021
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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.
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Old 7th December 2021
11B40 11B40 is offline
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+1 for Avon speedmaster. S&M on the rear.
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