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Your front tire should be inflated to 38-40 psi. I can't find any listing for your rear tire, but, if you had the stock 120/90/17 it would require 40-42 psi.A Metzeler 130/90/17 for your bike requires 46 psi for proper inflation so I'm not really sure on what to advise you because I'm not familier with a Durotour tire at all.

Try contacting the rear tire's manufacturer to give you specifics on that particular tire on your bike and ask them if the front tire is compatible with the rear tire just to be on the safe side.

Vic
 

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Axelwik, using original inflation pressures that were good for a bike that was built over 25 years ago may not apply if you are using modern day tires. I my humble opinion it's best to use the tire manufacturer's recommended inflation pressure for the specific application and loading, although I do fully agree that maximum indicated tire inflation is not always the best choice, but, it usually does give better load carrying ability, performance, fuel economy and safety margin than running a tire slightly underinflated..

Itcertainly is akward when mixing modern technology with old technology and really needs the touch of the factory engineers and the expert rider's who can take the bikes to the limits and come up with overall safety inflation averages for everyday blokes like us.

Vic
 

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I just want to say thatproper tire pressureall depends on the specific tire that was built specifically for each application.

The only time that OEM tire pressures apply are when the tires being used are OEM spec. Any variation will require testing and experimentation to correctly determine appropriate pressure.

Cord, constructionmaterials and rubber compounds also affect best tire pressure settings, as do tire loading and max speed.

For best results I would follow the tire manufacturers recomendations because they have to live with the results of the tire's life, whereas the bike manufacturer only needs the tires to get the bike out the factory's door.

Vic
 
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