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.


Like us on Facebook! Regular shirt GIVEAWAYS and more

Advertisement

Reply
Share This Thread: 
Subscribe to this Thread Thread Tools
Old 11-09-2008, 10:36 PM   #1
bioGuru
Aut inveniam viam aut fac
 
bioGuru's Avatar
 
Join Date: Sep 2008
Location: Woodlands area
Feedback Rating: (4)
Posts: 2,789

Experience: 3 years

Bike(s):
2008 Suzuki GSX650F - sold




Member Garage





tire pressure question

Just wondering just how significant effects small tire pressure is to the handling of a bike?

So I am practicing in the parking lot again and I feel like the rear tire is slipping more than it should and the front feels soft. I check the pressure its 30 in front and 40 in back. Specs call for 36 front/ back for solo riding. Haven't ridden since I corrected the problem so I can't comment if it took care of my problem.

But my question is should that amount of tire pressure imbalance cause any noticeable handling issues? or am I just imagining things?
__________________
web banner 392x72

Motorcycling in itself is not inherently dangerous. But to an even greater degree than the sea, it is terribly unforgiving of any carelessness, incapacity or neglect.
bioGuru is offline   Reply With Quote
Similar Topics
Thread Thread Starter Forum Replies Last Post
Tire Pressure Consensus Question, NOT the one youíre thinking Classax Taking it to the Track 11 07-05-2015 06:34 PM
tire pressure Light General Discussion (Moto Related) 17 09-09-2013 10:50 AM
Michelin Pilot Pure tire pressure question Tojo92 Taking it to the Track 29 09-22-2012 05:58 PM
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 hardcoresteve Stunters Lounge 7 06-01-2007 12:41 AM
Advertisement
Old 11-09-2008, 10:40 PM   #2
level5
moving chicane
 
Join Date: Aug 2006
Feedback Rating: (0)
Posts: 5,825












what are you practicing at the parking lot? tires pressure differential does make a difference.
level5 is offline   Reply With Quote
Old 11-09-2008, 10:40 PM   #3
v4lu3s
Senior Member
 
v4lu3s's Avatar
 
Join Date: Jun 2008
Location: Conroe
Feedback Rating: (1)
Posts: 4,381

Experience: 4 years

Bike(s):
2003 CBR 600 F4i -- Sold




Member Garage


correct the pressure and see how it feels. in the front that is nearly 17% difference in pressure, which is significant. I know when i last checked my pressure things felt soft from and rear, and I was about 8 lbs down front and rear...airing em back up felt a lot better to me.
v4lu3s is offline   Reply With Quote
Old 11-09-2008, 10:58 PM   #4
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





yes, a small change can make a noticeable difference in feel. Start at the recommended PSI and fine tune a couple PSI either way to suit your style.
__________________
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 11-09-2008, 11:10 PM   #5
tiatool
Pro Racer Mode Enabled
 
tiatool's Avatar
 
Join Date: Apr 2008
Location: Gunspoint
Feedback Rating: (14)
Posts: 8,702

Experience: 10+ years
Trackdays: 10+

Bike(s):
08 Raven
05 Vstar 1100





Is this cold or hot psi??

If your tire is slipping in a parking lot, you need a new back tire.

It also depends on what tire you are running. SOOOOOOOOOOOOOOoooooooo

What tire are you running?
tiatool is offline   Reply With Quote
Old 11-09-2008, 11:57 PM   #6
bioGuru
Aut inveniam viam aut fac
 
bioGuru's Avatar
 
Join Date: Sep 2008
Location: Woodlands area
Feedback Rating: (4)
Posts: 2,789

Experience: 3 years

Bike(s):
2008 Suzuki GSX650F - sold




Member Garage





Thanks - I will check it tomorrow (depending on the rain)

Quote:
Originally Posted by level5 View Post
what are you practicing at the parking lot? tires pressure differential does make a difference.
Tight, slow turns, and other general stuff. But also faster turns and figure 8s. Going as fast as I feel comfortable making a turn and then going again a little faster.

Quote:
Originally Posted by tiatool View Post
Is this cold or hot psi??

If your tire is slipping in a parking lot, you need a new back tire.

It also depends on what tire you are running. SOOOOOOOOOOOOOOoooooooo

What tire are you running?
Cold PSI. These are the stock tires on a bike with less than 850 miles (I bought it at 744). Bridgestone Battlax BT020.

After looking at it I think the problem may that I was just using a part of the tire that had never touched concrete before? Other than the middle of the tire the edges were still slick looking and still have the little sprue nubs(?) on them.


Thanks for everyone's help. I will certainly start checking the tire pressure more regularly.
__________________
web banner 392x72

Motorcycling in itself is not inherently dangerous. But to an even greater degree than the sea, it is terribly unforgiving of any carelessness, incapacity or neglect.

Last edited by bioGuru; 11-09-2008 at 11:59 PM.
bioGuru is offline   Reply With Quote
Old 11-10-2008, 12:19 AM   #7
level5
moving chicane
 
Join Date: Aug 2006
Feedback Rating: (0)
Posts: 5,825












maybe the part you are slipping is the part that needed to scrub off. If you are doing a lean, you need to lower the pressure. The pressure you running is more likely for 2 up riding. Make sure you wear your gear when you practice.
level5 is offline   Reply With Quote
Old 11-11-2008, 09:11 PM   #8
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





Recommended pressure is just that... the "starting" pressure for the rider. From there you fine tune to adjust the style of riding you do.

Track riders run lower pressure to account for the pressure rise from tire heat, plus to allow a little more tire spread when leaned over in turns.

Two up and heavier riders add a little pressure to account for the weight.

For probably 90% of street riders, the recommended pressure is a real good baseline and won't need changed.

The other thing people forget, is that air temp affects the pressure as well, so you need to make a habit of checking your tires at least once a week.
__________________
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 11-11-2008, 09:14 PM   #9
CaligoneTx
Forest Gnome Tour Guide
 
CaligoneTx's Avatar
 
Join Date: Sep 2007
Location: Valhalla
Feedback Rating: (1)
Posts: 21,558

Experience: 10+ years

Bike(s):
Triumph 675r
Ducati 748
Hyosungs (250r + 650r)
Honda 900rr
Suzuki Busa1300r (+2 bikes)






Send a message via AIM to CaligoneTx Send a message via Yahoo to CaligoneTx
and some tires themselves actually require a little more air.
__________________
triumphsig
CaligoneTx is offline   Reply With Quote
Old 11-11-2008, 09:31 PM   #10
blends
NYYYYYYEAAOWWWWWW
 
Join Date: Apr 2008
Location: mission bend
Feedback Rating: (3)
Posts: 7,307

Experience: 2 years
Trackdays: 10+






Member Garage





Send a message via AIM to blends
Good question. Now that its getting colder should we run different pressure? A couple pounds lower than during the summer heat?
blends is offline   Reply With Quote
Old 11-11-2008, 09:35 PM   #11
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





Quote:
Originally Posted by blends View Post
Good question. Now that its getting colder should we run different pressure? A couple pounds lower than during the summer heat?
I would stay at the same recommended pressures or what ever has been working for you, but don't assume that they are the same since the last time you checked them.

Also people need to be aware that with colder weather, the roads are cooler, and may not offer the same amount of traction as they did last month. I find the country back roads get a bit greasy during the hot summertime, so this is my favorite time of year for grip. Also keep an eye for leaves in the roads and pin needles; those offer zero traction in curves.
__________________
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 11-11-2008, 09:57 PM   #12
blends
NYYYYYYEAAOWWWWWW
 
Join Date: Apr 2008
Location: mission bend
Feedback Rating: (3)
Posts: 7,307

Experience: 2 years
Trackdays: 10+






Member Garage





Send a message via AIM to blends
Quote:
Originally Posted by texlurch View Post
I would stay at the same recommended pressures or what ever has been working for you, but don't assume that they are the same since the last time you checked them.

Also people need to be aware that with colder weather, the roads are cooler, and may not offer the same amount of traction as they did last month. I find the country back roads get a bit greasy during the hot summertime, so this is my favorite time of year for grip. Also keep an eye for leaves in the roads and pin needles; those offer zero traction in curves.
i did see a LOT of leaves in the corners in the twisties between simonton and brookshire a couple days ago. wasn't sure about the traction in that type of road conditions so i dropped my speed about 10mph.
__________________
ಠ_ಠ
blends is offline   Reply With Quote
Reply


Thread Tools

Advertisement


All times are GMT -5. The time now is 05:43 AM.


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