tire & psi - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 19 Old 12-06-2015, 09:56 AM Thread Starter
ace
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tire & psi

newbie has got a2008 klr 650 put new tires on it "KENDA K761" front 90/90-21 rear 130/80-17. I ride street and gravel forest roads.What psi should I run both types of riding?
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post #2 of 19 Old 12-06-2015, 01:24 PM
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Hi Ace,
I ride mainly gravel and dirt. On gravel I'll run 15 font and 20 rear. On dirt or sand I go lower, 10 front and 10 to 15 rear. You will need to add bead locks if using pressures below 15psi to prevent the tire from slipping on the rim and tearing the valvestem out of the tube.This is how I know that....

It is also how I know the SW Motec crash bars work!!

I run 32 front and 35 rear on pavement.
You can experiment with different pressures to find what works for you.

JJ

It's not a Tractor....It's a LOCOMOTIVE!! Chugga Chugga
Woooo WOOOOO!!!!!
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post #3 of 19 Old 12-06-2015, 01:27 PM
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I've liked K761. For road unloaded, low-mid 20s f&r. Loaded I increase the rear to upper 20s to low 30s. For rocks and loose gravel I don't usually go below about 15 for an unloaded bike with an active 160Lb rider.
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post #4 of 19 Old 12-06-2015, 02:18 PM Thread Starter
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thanks. guards are great.I put a set of givi eng. guard on after my first trail ride of LOOSE DIRT + UP HILL+ WRONG GEAR= SLIDING DOWN HILL ON BIKES SIDE.
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post #5 of 19 Old 12-06-2015, 02:25 PM Thread Starter
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Quote:
Originally Posted by Grinnin View Post
I've liked K761. For road unloaded, low-mid 20s f&r. Loaded I increase the rear to upper 20s to low 30s. For rocks and loose gravel I don't usually go below about 15 for an unloaded bike with an active 160Lb rider.
THANKS. I like them so far. I have been running road 26 frt /28 rear and gravel 18-20 frt and rear. I am heavier 180 lb
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post #6 of 19 Old 12-06-2015, 05:27 PM
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Again, I'll suggest that we all should run 2 PSI Higher in the Skinny front tire than what we choose to run in the Fatter rear tire.
Asphalt or dirt or rocks. Be the rider 160 or 360 pounds! When you are on the brakes and/or going down hill ask yourself, which tire is carrying most of the load?

I truly believe that you will have more precise control and less chance of a pinched tube. Most pinch flats and rim dents are on the front, from too low tire pressure. Most other types of flats are on the rear.

I've been riding motorcycles since 1969 and fixing flats on other peoples bikes and occasionally my own ever since.

pdwestman
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post #7 of 19 Old 12-06-2015, 05:41 PM
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By weight my rear tire carries 2/3 or 66% of the total bike and rider weight. Under heavy braking you can transfer 70% of the weight to the front tire. That means the front can be carrying 104% of the total weight of the bike and rider. Therefore under maximum braking the rear wheel will be off the ground on any hill with less than a 4% grade. So to be safe only ride on hills with more than a 4% grade.

JJ

It's not a Tractor....It's a LOCOMOTIVE!! Chugga Chugga
Woooo WOOOOO!!!!!
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post #8 of 19 Old 12-07-2015, 10:47 AM
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Originally Posted by pdwestman View Post
Again, I'll suggest that we all should run 2 PSI Higher in the Skinny front tire than what we choose to run in the Fatter rear tire.
Asphalt or dirt or rocks. Be the rider 160 or 360 pounds! When you are on the brakes and/or going down hill ask yourself, which tire is carrying most of the load?

I truly believe that you will have more precise control and less chance of a pinched tube. Most pinch flats and rim dents are on the front, from too low tire pressure. Most other types of flats are on the rear.

I've been riding motorcycles since 1969 and fixing flats on other peoples bikes and occasionally my own ever since.

I agree; what people tend to forget is that regardless of % loads, the larger rear tire has a larger load carrying capacity for the same air pressure. I submit that unless you have a passenger or luggage, that the front needs more pressure than the rear.

Me? I run 20-22 front and 18-20 rear because a) less pressure and I'd worry about the valve stem (no rim locks) and pinch flats and b) I can't be bothered to air up/dwn everytime I transition from dirt to pavement. If I was going to run on the highway or mostly pavement, I'd up those pressures....probably by as much as 10psi.

2 cents,
Dave
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post #9 of 19 Old 12-07-2015, 11:42 AM
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Been thru so many tires I just ride on the rims now.

This is my son, with whom I am well pleased." ----God
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post #10 of 19 Old 12-07-2015, 08:24 PM
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Originally Posted by CheapBassTurd View Post
Been thru so many tires I just ride on the rims now.
CBT,
I'll bet you are 'kinda slow' thru the corners! Not much traction from metal!

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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