Tire Pressure with passenger
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Molto Verboso
Piaggio MP3 500
Joined: 22 Nov 2008
Posts: 1395
Location: North Georgia
Wed May 12, 2010 4:39 am quote
OK, my blonde is acting up. Daughter and I are leaving this afternoon for St. Augustine on the bike and I left my manual at home and don't remember the proper tire pressure for riding two up. I know I need more air, but could someone tell me how much? It's probably posted here somewhere, but I'm lazy .
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Location: Pleasant Hill, CA
Wed May 12, 2010 4:51 am quote
Front tyre (with passenger) 1.6 (1. bar.
Rear tyre (with passenger) 2.4 (2.6) bar.

So add 0.2 bar = 3psi to both front and back. Or, as I do, just run with 1.7 bar front and 2.5 bar rear all the time.
Veni, Vidi, Posti
. . 2008 Blue MP3 400. . di Peluria Orso .... 1993 Kawasaki Vulcan 500 ....... 2013 Honda NC700XD
Joined: 02 Jun 2008
Posts: 5950
Location: Milledgeville, GA
Wed May 12, 2010 5:07 am quote
jimc wrote:
Front tyre (with passenger) 1.6 (1. bar.
Rear tyre (with passenger) 2.4 (2.6) bar.

So add 0.2 bar = 3psi to both front and back. Or, as I do, just run with 1.7 bar front and 2.5 bar rear all the time.
In case you do not have a "BAR" gage with you this is 26 psi front and 38 psi rear. It should be on the MP3 on the label on the leg shield and or under the seat.
Veni, Vidi, Posti
Neutrino MP3 492.7 AK
Joined: 29 Mar 2008
Posts: 18059
Location: Kingston, Tennessee, Tn
Wed May 12, 2010 5:15 am quote
glad you were thinking about the added weight for tire pressure. Also you should adjust your shock settings up at least 1 notch or even to the top last one.
Hooked
2013 Suzuki Burgman 400ABS
Joined: 26 Feb 2010
Posts: 150
Location: Shrewsbury, MA
Wed May 12, 2010 5:20 am quote
Is the 500 different from the 400?

The manual for my 2009 400 has:

Front tire (with passenger) 26 PSI (33 PSI) (1.8 bar (2.3 bar))

Rear tire (with passenger) 33 PSI (41 PSI) (2.3 bar (2.8 bar))

Not a big difference but not quite the same.
Veni, Vidi, Posti
. . 2008 Blue MP3 400. . di Peluria Orso .... 1993 Kawasaki Vulcan 500 ....... 2013 Honda NC700XD
Joined: 02 Jun 2008
Posts: 5950
Location: Milledgeville, GA
Wed May 12, 2010 5:27 am quote
lloyd123 wrote:
Is the 500 different from the 400?

The manual for my 2009 400 has:

Front tire (with passenger) 26 PSI (33 PSI) (1.8 bar (2.3 bar))

Rear tire (with passenger) 33 PSI (41 PSI) (2.3 bar (2.8 bar))

Not a big difference but not quite the same.
Good point, I would think they would be the same as tires and weight are the same. I just converted Jim's numbers and thought they were a bit light (I run more even only 1 up), but my bike is at the shop so I can't check. His numbers are what is in the online manual.

Georgia Girl, check the numbers on the label on your ride.
Molto Verboso
Piaggio MP3 500
Joined: 22 Nov 2008
Posts: 1395
Location: North Georgia
Wed May 12, 2010 6:46 am quote
Thanks guys - I think the 2 up says the 33 and 41 - I looked it up last week and then forgot this morning I'll look on my way out. I'm technically supposed to be working, but I am pretty useless today Oh, and thanks OAD, I didn't think about the preload.
Ossessionato
MP3 500, Ducati ST4s
Joined: 21 May 2008
Posts: 2611
Location: Nomad currently in Placerville, CA
Wed May 12, 2010 9:21 am quote
I think it's funny that the manual goes by number of passengers not actual weight. A couple of gals or jockeys could easily weigh in at 228 lbs. or less which is roughly what I weigh. A good friend weighs around 330 lbs.

I would think you and your daughter should be fine at a pound or two less inflation than the label recommends; while my friend and I would probably be unsafe at any psi.
Hooked
2009 MP3 400ie FL until March 1st 2011 and now riding a Suzuki GSX1250FA ST.
Joined: 08 Sep 2009
Posts: 205
Location: Worcester, England
Wed May 12, 2010 11:10 am quote
lloyd123 wrote:
Is the 500 different from the 400?

The manual for my 2009 400 has:

Front tire (with passenger) 26 PSI (33 PSI) (1.8 bar (2.3 bar))

Rear tire (with passenger) 33 PSI (41 PSI) (2.3 bar (2.8 bar))

Not a big difference but not quite the same.
Sorry lloyd123, but your picture shows a 2008 model 400 with no backrest and the old style grill. My 2009 model manual doesn't have two sets of tyre pressures, so there is no change to the tyre pressures when carrying a passenger.

Front tyre pressure 1.6 bar
Rear tyre pressure 2.5 bar
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2xGP800, Fuoco, X9 500 Evo, The Hornet (GT200, aka Love Bug), 'Olive' (GT200) and 'Dimples' - a GTS 300
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Posts: 31496
Location: Pleasant Hill, CA
Wed May 12, 2010 11:39 am quote
That's an omission in the manual - you should still add some extra pressure when the load is significantly increased. Otherwise you risk over-heating the tyres and/or introducing abnormal wear.
Hooked
2009 MP3 400ie FL until March 1st 2011 and now riding a Suzuki GSX1250FA ST.
Joined: 08 Sep 2009
Posts: 205
Location: Worcester, England
Wed May 12, 2010 11:55 am quote
jimc wrote:
That's an omission in the manual - you should still add some extra pressure when the load is significantly increased. Otherwise you risk over-heating the tyres and/or introducing abnormal wear.
Page 12 of the updated workshop manual backs up what it says in the 2009 model user manual:

Front tyre pressure with passenger (MP3 400 i.e.) 1.6 bar (1.8 bar)
Rear tyre pressure with passenger (MP3 400 i.e.) 2.4 bar (2.6 bar)
Front tyre pressure (MP3 400 i.e. RL) 1.6 bar
Rear tyre pressure (MP3 400 i.e. RL) 2.5 bar

So they are both wrong?
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2xGP800, Fuoco, X9 500 Evo, The Hornet (GT200, aka Love Bug), 'Olive' (GT200) and 'Dimples' - a GTS 300
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Wed May 12, 2010 12:02 pm quote
To be honest the difference of a couple of psi is neither here nor there if riding at urban speeds - which is why my tyres are kept as standard in the middle of the range. It's only on longer faster journeys that you really want to be more conscientious.
Hooked
2009 MP3 400ie FL until March 1st 2011 and now riding a Suzuki GSX1250FA ST.
Joined: 08 Sep 2009
Posts: 205
Location: Worcester, England
Wed May 12, 2010 12:15 pm quote
This may be of use to forum members:

TyreSafe leaflet motorcycle tyres.pdf
 Description:

Download
 Filename:  TyreSafe leaflet motorcycle tyres.pdf
 Filesize:  171.01 KB

Hooked
2013 Suzuki Burgman 400ABS
Joined: 26 Feb 2010
Posts: 150
Location: Shrewsbury, MA
Wed May 12, 2010 12:18 pm quote
US different than Europe
PaterAnt wrote:
Sorry lloyd123, but your picture shows a 2008 model 400 with no backrest and the old style grill. My 2009 model manual doesn't have two sets of tyre pressures, so there is no change to the tyre pressures when carrying a passenger.

Front tyre pressure 1.6 bar
Rear tyre pressure 2.5 bar
The US didn't get the new udated RL version for 2009. Mine is listed as a 2009 by both the VIN and the EPA compliance sticker. The new models arriving now are the RL version and have the updated grill and backrest but I think they are considered 2010's - haven't seen one so I can't be sure.
Hooked
2009 MP3 400ie FL until March 1st 2011 and now riding a Suzuki GSX1250FA ST.
Joined: 08 Sep 2009
Posts: 205
Location: Worcester, England
Wed May 12, 2010 12:34 pm quote
Re: US different than Europe
lloyd123 wrote:
PaterAnt wrote:
Sorry lloyd123, but your picture shows a 2008 model 400 with no backrest and the old style grill. My 2009 model manual doesn't have two sets of tyre pressures, so there is no change to the tyre pressures when carrying a passenger.

Front tyre pressure 1.6 bar
Rear tyre pressure 2.5 bar
The US didn't get the new udated RL version for 2009. Mine is listed as a 2009 by both the VIN and the EPA compliance sticker. The new models arriving now are the RL version and have the updated grill and backrest but I think they are considered 2010's - haven't seen one so I can't be sure.
That explains the confusion. The US probably had a warehouse full of the old models to flog before importing the new model! Mine took a month to arrive direct from Italy after it was ordered in July last year.
Veni, Vidi, Posti
MP3 500 - Brutto Moto
Joined: 10 Jun 2008
Posts: 5053
Location: Austin, TX
Wed May 12, 2010 2:24 pm quote
FFS people - the pressure is related to the tire and load - not the freakin bike and year it was produced.
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2xGP800, Fuoco, X9 500 Evo, The Hornet (GT200, aka Love Bug), 'Olive' (GT200) and 'Dimples' - a GTS 300
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Posts: 31496
Location: Pleasant Hill, CA
Wed May 12, 2010 3:48 pm quote
BubbaJon wrote:
FFS people - the pressure is related to the tire and load - not the freakin bike and year it was produced.
Thank you. Not rocket-science, or slavishly following possibly probably mis-interpreted manuals.

Common sense should prevail!
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