I don't know where tbone57 got his info from, but this is directly from the Metzeler web page, notice that they only recommend a minimum tire pressure.
I did a quick scan of there warranty page and couldn't find a thing about them rejecting claims because of air pressure.
Metzeler : recommended tire pressures
PRODUCTS
Catalogue Technology New Products Product brochure downloads Fitment Chart Dealer Locator Tire Registration Note recommended tire pressures Important Upgrade info Tire Pressure
Always inflate tires to the correct pressure as indicated in the owner's manual. However Metzeler North America has found the air pressure suggestions listed below will improve mileage and customer satisfaction especially if a emphasis is placed on running the air pressure towards the maximum as stated on the sidewall. Check cold tire pressures frequently. Correct tire pressure is crucial for safe handling. Over inflation may impair ride comfort and reduce the contact patch between the tire and driving surface of the tires. Insufficient air pressure will result in poor handling and cause a tendency for the motorcycle to "wander". In addition, improper and insufficient tire will cause accelerated tire wear, increased fuel consumption, less control and the possibilities for tire failure to due an overload/under inflated operating situation.
Recommended Minimum Tire Pressures (PSI)
Touring/Cruiser
Alpha ME880 (MH, MT, MU tires) Solo 2 Up Light 2 Up Heavy
Front 36 40 40
Rear 38 40 40
ME880 Solo 2 Up Light 2 Up Heavy
Front 38-40 40-42 40-42
Rear 44-46 46-48 48-50
For bikes with the following rear tire sizes: 170/80-15, 180/70-15, 150/80-16, 160/80-16, 180/60R16, 180/70R16, 200/60R16, 240/50R16, 140/80-17, 160/70-17 D spec, 170/60R17, 210/50R17, 150/70-18, 180/55ZR18, 200/50R18, 210/40R18, 260/40R18, 280/35R18, 300/35R18, 260/35R21.
ME880 (tires as listed above) Solo 2 Up Light 2 Up Heavy
Rear 40 42 42
Sport, Sport Touring (radial & bias)
Front Solo 2 Up Light 2 Up Heavy
80/90-3.25 32-34 32-34 34-36
100/80-3.50 32-34 34-35 35-36
110/70-120/90 34-36 36-38 38-40
130/60-150/80 34-36 36-38 40-42
Rear Solo 2 Up Light 2 Up Heavy
4.00-100/90 34-36 36-38 38-40
4.25-110/90 34-36 36-38 38-40
120/80-130/90 36-38 38-40 40-42
140/70-200/50 36-38 38-40 40-42
140/90-150/90 38-40 40-42 40-42
Dual Purpose (125cc-500cc)
Solo 2 Up Light 2 Up Heavy
Front 24-34 26-34 28-38
Rear 31-36 33-38 35-40
Dual Purpose (501cc-749cc)
Solo 2 Up Light 2 Up Heavy
Front 24-34 26-36 28-38
Rear 31-36 33-38 35-40
Dual Purpose (750cc & up )
Solo 2 Up Light 2 Up Heavy
Front 31-33 33-35 35-42
Rear 35-37 37-39 39-42
Last Revised: 2008-07-01 Copyright © 2010 Legal information - Website Info - Site Map - Contacts