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Discussion Starter #1
Hi,

i need new tires for my Ipotesi. Currently i am using Metzeler Perfect ME 77, front 2.75-18 48P Reinforced and at the rear 3.25-18 59P Reinforced. The ME 77 is still available, but not at the required sizes.

Any suggestions on alternatives? The only ones i could found with speed index S, which is required regarding my official documents, are the Michelin M 45.

Best regards
Klaus
 

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Klaus I have the Michelin M45 on my 350B as well.
It is in deed a challenge to find this small dimension tyres for the required speed ratings.
I would suggest to look at the Heidenau Tyres as well.
They have the K45 (2,75-18S) and the K34 (3.25-18S).
If the milage You go is not that great and You are more or less only on closed tracks, than Heidenau has also softer tyres (Rennsport) called RSW.
Alone they do not have a 3.25 as RSW.
I fancy the RSW for my 350B and will might change to a 3.50 (K65 RSW) with a 2.15 rim at the rear.
For the front I would like to go for the 2.75 (K45 RSW).
 

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Discussion Starter #4
Thanks for the tips.

@Ralf: I checked the Heidenau Tyres too, but they do not offer both sizes from a single type. I don't know if its a good idea to mix K45 with K34. The K45 is actually for use without a tube. K39 is the Tube Type version, but only with Speed Index P = 150 km/h.

From Metzeler i found the ME 22, but only whith Speed Index P too. And the front tyre is only Load Index 42 (150 kg) instead of 48 (= 180 kg) as most of the other ones.

I am not sure if the german TÜV will look at the Speed Index. They did not do that with my current tyres. But you never know. And i think, my Ipotesi will never go faster than 150 km/h.

@ Helmut: The Mitas are only Speed Index P too.

Best regards
Klaus
 

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http://www.reifenwerk-heidenau.de/modules/reifenliste/view.php?point=2&rtyp=9&sv=1&profil=20&pic=28
http://www.reifenwerk-heidenau.de/modules/reifenliste/view.php?point=2&rtyp=9&sv=1&profil=14&pic=16
Here are both tyres of Heidenau again. In my eyes are both tyres in Your size available and this in speed rating S = 180kph. And yes front tyres and rear tyres have different names, codes, alpha numerics, etc.
Even modern tyres of the same brand, same name have different profiles on front versus rear tyres.
A good example is also the ancient Metzeler Rille for the front and Block for the rear.
If You are worried I would contact Heidenau other than that this tyres should be fine.
 

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Ahh and as of my knowledge is there no problem to fit a tubeless tyre with a tube.
 

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Discussion Starter #7
Its a problem if you try to fit a tubeless tyre with a tube on a rim for tubeless tyres. Wenn Du den Schlauch aufpumpst, kann nämlich die Luft zwischen Reifen und Schlauch nicht entweichen. Aber das ist im vorliegenden Fall nicht das Problem.
 

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The load index should be the same or higher than the maximum weight of the vehicle. Since a bike has only two wheels where every single tyre has to carry the entire vehicle weight (Braking / Wheelies), the load capacity has to be as high as the maximum allowable weight of the vehicle.
Now my 350B weighs 149kg dry and the maximum weight should be 289kg. Top speed 169kph. So the specs.
This means the 2.75x18 for the front and the 3.25x18 for the rear should have a load index of at least 65.
Plus the speed index of S = 180 kph.
Your Ipotesi in OEM configuration weighs roughly 160kg dry. Maximum permitted vehicle weight would be over 300kg. Not to mention all the Felotti aluminium stuff plus fairing.
This would require a load index of at least 66 - 67.
I honestly doubt that You will find such tyres.
Well this leaves truely the question what are our historic MV fellows outside the German speaking world using ?
 
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