MotoHouston.com MotoHouston.com
Register Members List Member Map Media Calendar Garage Forum Home Mark Forums Read

Go Back   MotoHouston.com > General Discussion > General Discussion (Moto Related)
Forgot info?

Welcome to MotoHouston.com! You are currently viewing our forums as a guest which gives you limited access to the community. By joining our free community you will have access to great discounts from our sponsors, the ability to post topics, communicate privately with other members, respond to polls, upload content, free email, classifieds, and access many other special features. Registration is fast, simple and absolutely free, join our community!

Register Today!

If you have any problems with the registration process or your account login, please contact us.


FREE MH Decals by MAIL!

Advertisement

Reply
Share This Thread: 
Subscribe to this Thread Thread Tools
Old 09-24-2014, 05:52 PM   #1
edgarf23
Senior Member
 
edgarf23's Avatar
 
Join Date: Jan 2013
Feedback Rating: (0)
Posts: 143

Experience: 4 years
Trackdays: 2

Bike(s):
1993 Harley Sportster XLH1200
2007 Honda VFR 800








Tire pressure

So went for a two up ride last night with the wife and things almost went bad quickly. Once we hit I10 and hit speeds of 75+ the front end of the VFR felt light and shaky. I had a feeling like i didn't have enough rubber on the road. We pulled over on into a gas station and i check the tire pressure. Front tire had 45PSI and rear had 52PSI ( should be 36 front and 42 rear). I had just filled the tires up that day and I check my gauge and it must be faulty. Please always ensure ur tire pressure is correct.
edgarf23 is offline   Reply With Quote
Similar Topics
Thread Thread Starter Forum Replies Last Post
Tire pressure the mother General Discussion (Moto Related) 6 10-31-2009 10:10 AM
My tire is low tire pressure. Who is the best place to take it for air? hotnanas How To's and Q & A's 74 11-19-2008 01:50 PM
tire pressure YZFracer212 Taking it to the Track 25 09-30-2008 08:03 AM
tire pressure cp6rider How To's and Q & A's 6 02-23-2008 09:11 PM
Tire Pressure... 100f General Discussion (Moto Related) 28 11-20-2007 09:27 AM
Advertisement
Old 09-24-2014, 05:58 PM   #2
bumblebee
Yeah I'm flippin' YOU off
 
bumblebee's Avatar
 
Join Date: Oct 2006
Location: Pearland
Feedback Rating: (3)
Posts: 12,264


Bike(s):
'74 Suzuki GT380
'82 XS650 StreetTracker
'10 Ducati Streetfighter
'83 Yamaha Seca 900






Tire pressure changes with temp. With 2 people and sustained elevated speed the tires are gonna heat up.
Although a 10 psi increase is a pretty big change.
__________________
Asphalt is for racing... dirt is for growing potatoes. - J. Diester
When seconds count... the police are only minutes away.
Grow up and be a productive member of society already.
Bevo- "I lack skillz"
bumblebee is offline   Reply With Quote
Old 09-24-2014, 06:03 PM   #3
r6racer
track
 
r6racer's Avatar
 
Join Date: Dec 2012
Location: Houston
Feedback Rating: (4)
Posts: 8,582

Experience: 2 years
Trackdays: 10+

Bike(s):
2008 Yamaha R6 Race/track
2012 Yamaha WGP R6
2004 Kawasaki KLx250 2-stroke
2008 Yamaha R6 Street *Sold*
2005 Yamaha R6 Track *Sold*

Member Garage





when your tires heat up its usually going to be around a 3-4 psi increase when the tires become warmed up. In the past, Ive noticed that several gauges i have bought from walmart, autozone, advance auto parts, oreilys etc have always been more than +/- 1psi and especially some of the "slime" branded ones those ones are always off pretty bad, one i bought was showing 10psi less than what was really in the tire.

the stockon gauge from cycle gear is fairly accurate, and the motion pro gauges are really good. Id also talk to one of the sponsers on here to see if they recommend anything

Also, I have a calibrated air pressure gauge that ive had checked with p1 racing's master gauge. i live in the northwest side, if you or anyone is wanting to check to see if their gauge is at least somewhat accurate, you are welcome to swing by and compare it with my gauge

Last edited by r6racer; 09-24-2014 at 06:06 PM.
r6racer is offline   Reply With Quote
Old 09-24-2014, 06:06 PM   #4
WbDDoT
Brazoria County Bikers
 
WbDDoT's Avatar
 
Join Date: Sep 2014
Location: Freeport, TX
Feedback Rating: (0)
Posts: 476

Experience: 10+ years
Trackdays: 3

Bike(s):
2008 Yamaha YZF-R1
2008 Kawasaki Ninja 250r
1996 Yamaha YZ 125
1995 Suzuki GS600 Katana (Sold)
2005 Kawasaki ZX-6R (Sold)






How do you REALLY know how close the gauges are to being accurate?
WbDDoT is offline   Reply With Quote
Old 09-24-2014, 06:08 PM   #5
r6racer
track
 
r6racer's Avatar
 
Join Date: Dec 2012
Location: Houston
Feedback Rating: (4)
Posts: 8,582

Experience: 2 years
Trackdays: 10+

Bike(s):
2008 Yamaha R6 Race/track
2012 Yamaha WGP R6
2004 Kawasaki KLx250 2-stroke
2008 Yamaha R6 Street *Sold*
2005 Yamaha R6 Track *Sold*

Member Garage





Quote:
Originally Posted by WbDDoT View Post
How do you REALLY know how close the gauges are to being accurate?
i added a little more to my post at the end, check it out.

if you want to check with a master gauge, then p1 racing/south central racing can take care of that. HOPD and Motorcycles Unlimited (motohouston sponsers) may also have something like this, i would call and check.
r6racer is offline   Reply With Quote
Old 09-24-2014, 06:16 PM   #6
bluewave18
Safety Third
 
bluewave18's Avatar
 
Join Date: Oct 2007
Location: S.E.
Feedback Rating: (0)
Posts: 34,098

Experience: 10+ years

Bike(s):
08 Busa
03 XR 50








I can see the rear pressure causing an issue as I have experienced that before
bluewave18 is offline   Reply With Quote
Old 09-24-2014, 06:56 PM   #7
SixGixx
TXSR Organizer, CMRA #323
 
SixGixx's Avatar
 
Join Date: Jun 2014
Location: Killeen, TX
Feedback Rating: (0)
Posts: 96

Experience: 10+ years
Trackdays: 10+

Bike(s):
14 Ducati Monster 1200 S
07 Suzuki GSX-R 600 -Race-
02 Yamaha FZ-1 (SOLD)


Member Garage





I wouldn't think your front tire being 9 psi over the recommended psi would be that much of an issues on the highway. If you checked your pressure with the gauges at gas station it was prob off some. I would check it with your gauge again, let some air out of both tires and go back out on a short ride and see if it still does it.
SixGixx is offline   Reply With Quote
Old 09-24-2014, 07:40 PM   #8
1340HIGH
1340HIGH
 
1340HIGH's Avatar
 
Join Date: Oct 2008
Location: N.W.Houston Jersey Village
Feedback Rating: (0)
Posts: 529

Experience: 10+ years

Bike(s):
Harley FXDC
420 Honda Rancher ATV








Maybe not just pressure in the tire
Did it feel different with just you on the bike? As you may know adding a passenger adds weight to both tires but more so on the rear and shifts the center of gravity to the rear, this can make the front feel lighter and will make the bike easier to wheelie and flip.
1340HIGH is offline   Reply With Quote
Old 09-24-2014, 08:20 PM   #9
bluewave18
Safety Third
 
bluewave18's Avatar
 
Join Date: Oct 2007
Location: S.E.
Feedback Rating: (0)
Posts: 34,098

Experience: 10+ years

Bike(s):
08 Busa
03 XR 50








Over inflated rear tires and be sketchy as . Especially in a turn
bluewave18 is offline   Reply With Quote
Old 09-24-2014, 10:26 PM   #10
edgarf23
Senior Member
 
edgarf23's Avatar
 
Join Date: Jan 2013
Feedback Rating: (0)
Posts: 143

Experience: 4 years
Trackdays: 2

Bike(s):
1993 Harley Sportster XLH1200
2007 Honda VFR 800








Quote:
Originally Posted by r6racer View Post
when your tires heat up its usually going to be around a 3-4 psi increase when the tires become warmed up. In the past, Ive noticed that several gauges i have bought from walmart, autozone, advance auto parts, oreilys etc have always been more than +/- 1psi and especially some of the "slime" branded ones those ones are always off pretty bad, one i bought was showing 10psi less than what was really in the tire.

the stockon gauge from cycle gear is fairly accurate, and the motion pro gauges are really good. Id also talk to one of the sponsers on here to see if they recommend anything

Also, I have a calibrated air pressure gauge that ive had checked with p1 racing's master gauge. i live in the northwest side, if you or anyone is wanting to check to see if their gauge is at least somewhat accurate, you are welcome to swing by and compare it with my gauge
I would really like to take you up on the offer to check my gauges. I currently have three different ones by three different brands. I'm curious to see if anyone of them will be dead on with the readings.

After i took some air out from both the rear and front the bike felt normal at hwy speeds. I just baffles me how important air pressure is and from this point forward it wont be over looked.
edgarf23 is offline   Reply With Quote
Old 09-24-2014, 10:51 PM   #11
r6racer
track
 
r6racer's Avatar
 
Join Date: Dec 2012
Location: Houston
Feedback Rating: (4)
Posts: 8,582

Experience: 2 years
Trackdays: 10+

Bike(s):
2008 Yamaha R6 Race/track
2012 Yamaha WGP R6
2004 Kawasaki KLx250 2-stroke
2008 Yamaha R6 Street *Sold*
2005 Yamaha R6 Track *Sold*

Member Garage





Quote:
Originally Posted by edgarf23 View Post
I would really like to take you up on the offer to check my gauges. I currently have three different ones by three different brands. I'm curious to see if anyone of them will be dead on with the readings.

After i took some air out from both the rear and front the bike felt normal at hwy speeds. I just baffles me how important air pressure is and from this point forward it wont be over looked.
yeah when i first started riding, i under estimated the importance of tire pressures but have learned a lot since then. i get off at 530 so evening is fine and looks like youre in the katy area which is right next to me (barker cypress)

i'll pm u my number
r6racer is offline   Reply With Quote
Old 09-25-2014, 07:56 AM   #12
Neon Samurai
3090 MotoGP Champion
 
Neon Samurai's Avatar
 
Join Date: Mar 2012
Location: Kings Landing
Feedback Rating: (0)
Posts: 3,221

Experience: 10+ years

Bike(s):
2010 Ducati Streetfighter (sold)
2012 Triumph Speed Triple R
2008 Triumph Sprint ST (Sold)
2014 BMW s1000R
2012 Aprilia Tuono (sold)






I watch my tire pressure like a hawk...i find having it dialed in right is like a free tune up on handling.
__________________
ASSASSINO
Neon Samurai is offline   Reply With Quote
Old 09-25-2014, 08:39 AM   #13
Volfy
Fava Beans & a Chianti
 
Volfy's Avatar
 
Join Date: Dec 2011
Location: SW Houston
Feedback Rating: (0)
Posts: 3,504

Experience: 10+ years
Trackdays: 1

Bike(s):
'15 300RR
'15 250XCF-W
'14 Trophy SE
'10 VFR1200F
'05 GSXR600 (track)

Member Garage





Quote:
Originally Posted by edgarf23 View Post
So went for a two up ride last night with the wife and things almost went bad quickly. Once we hit I10 and hit speeds of 75+ the front end of the VFR felt light and shaky. I had a feeling like i didn't have enough rubber on the road. We pulled over on into a gas station and i check the tire pressure. Front tire had 45PSI and rear had 52PSI ( should be 36 front and 42 rear). I had just filled the tires up that day and I check my gauge and it must be faulty. Please always ensure ur tire pressure is correct.
With 75+mph wind pushing on the bike/rider (much of it above CG), and a pillion in the back, you have a lot of forces that were rotating the bike rearward and reducing the weight over the front axle. Combine that with the over inflating, and I'm not surprised your bike felt that way.

If you have bar risers on that VFR, that would make things worse.
Volfy is offline   Reply With Quote
Old 09-25-2014, 08:50 AM   #14
BD#270
Senior Member
 
BD#270's Avatar
 
Join Date: Apr 2008
Location: Copperfield
Feedback Rating: (0)
Posts: 960

Experience: 10+ years
Trackdays: 10+

Bike(s):
2009 ZX-10R race bike
2016 Honda Grom
CRF 250







Send a message via AIM to BD#270
The liquid filled Professional Tire Pressure Gauge from Motion Pro is very accurate. Some of the inexpensive gauges can easily be off by as much as 5 psi in either direction. It retails for $99. 25% discount on this item for Motohouston if anyone is interested. I keep 2 in stock at all times.
BD#270 is offline   Reply With Quote
Liked this post:
Old 09-25-2014, 10:40 AM   #15
texlurch
Official MH tag inspector
 
texlurch's Avatar
 
Join Date: Aug 2006
Location: Smack dab in the middle of Colo
Feedback Rating: (2)
Posts: 10,236

Experience: 10+ years
Trackdays: 1

Bike(s):
04 ZX-10R
02 ZX-12R BOTM 12/11
00 ZX-12R
07 GSXR 600
00 TL1000R BOTM 07/12 (sold)

Member Garage





Also keep in mind even a calibrated gauge can be off at wider ends of the pressure ranges. A low range gauge for drag tires is dead on at 1-15 psi, but off at 35.. the narrower the range the better.

Best thing to do is find the pressure that works best for you and your bike, and use the same gauge every time. That way it doesn't matter if your gauge is off or not, as long as it is consistent.
__________________
sig pic
A wise man once told me: "No matter how fine she is, just remember. Somewhere, someone is tired of her !"
.
.... Home of the "Black Ninja's"
texlurch is offline   Reply With Quote
Old 09-25-2014, 01:31 PM   #16
Neon Samurai
3090 MotoGP Champion
 
Neon Samurai's Avatar
 
Join Date: Mar 2012
Location: Kings Landing
Feedback Rating: (0)
Posts: 3,221

Experience: 10+ years

Bike(s):
2010 Ducati Streetfighter (sold)
2012 Triumph Speed Triple R
2008 Triumph Sprint ST (Sold)
2014 BMW s1000R
2012 Aprilia Tuono (sold)






That Stockton Tool one seems to be a good one.
__________________
ASSASSINO
Neon Samurai is offline   Reply With Quote
Reply


Thread Tools

Advertisement


All times are GMT -5. The time now is 04:02 PM.


MotoHouston.com is not responsible for the content posted by users.
Privacy Policy