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Sportster tyres and tubes

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hans56kh

Posts: 54

Joined: Mon Dec 13, 2004 1:01 am

Post Wed Jul 24, 2013 9:55 am

Sportster tyres and tubes

The 1973 Sportster had originally a 4.24-18 rear tyre.
Which good brands are still producing a tyre with this dimension?
The front tyre is MM90-19. Is this obsolete numbering identical to 100/90-19?
The tubes for both tyres are originally having a rubber valve stem.
Apart from at V-twin mfg, I cannot find these anywhere and would prefer a
good brand for the tubes. Anyone who knows where to find this?
Are the rubber stem tubes better or worse than the metal ones or does
this depend only on the type of rim you use? Thanks in advance, Hans.
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wilko

Posts: 159

Joined: Fri Jan 15, 2010 7:36 pm

Post Wed Jul 24, 2013 6:57 pm

Re: Sportster tyres and tubes

Try Mitas tyres or Heidanau. Both european manufacturers. They both make classic pattern tyres. Not sure of heidanau spelling but google should show it.
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aj speedshop

Posts: 1

Joined: Wed Sep 11, 2013 2:15 pm

Post Thu Sep 12, 2013 2:30 pm

Re: Sportster tyres and tubes

Since fitting a 19 inch heidenau front tyre to my 68 sporty it has been dirt track racing, trackday racing and road riding . It has preformed far better than it deserves to. It has a nice tall profile giving it a chunky effect with old school tread patern. I am well happy with my choice. Hope this has been of some use.
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hans56kh

Posts: 54

Joined: Mon Dec 13, 2004 1:01 am

Post Fri Sep 13, 2013 3:40 am

Re: Sportster tyres and tubes

In the mean while, I have put Dunlop K81 TT100 tyres. They were considered the top in the 1970s and are still put on some smaller bikes and on the Kawa W650 and the W800. Front is 100/90-19, exactly stock dimensions, for the rear 4.25/85-19, a lower height than stock but the same width. Does anyone have experience with these tyres?

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