Mountain Motorsports is located in Ontario, California, and is just a short drive to Upland, Inland Empire, Fontana, Chino Hills, Temecula, Rancho Cucamonga, Montclair, Rialto, Pomona, San Dimas, Claremont, La Verne, Glendora, San Gabriel Valley, Brea, Anaheim, Riverside, Moreno Valley, Covina, Corona, Diamond Bar and Norco, Orange County, Los Angeles County and the High Desert area. Mountain Motorsports is your premier powersports dealer for new and used dirt bikes, utility vehicles and more! See our inventory by category: ATVs, go-karts, motorcycles, scooters, utility vehicles especially the Polaris RZR line of UTVs. We are an authorized dealer for new Honda, Suzuki, Husqvarna and Polaris motorcycle, ATV, scooter, 4x4 utility vehicle sales. In addition to our large selection of new dirt bikes and UTVs from Suzuki, Polaris, Honda and Husqvarna; we have one of the largest used motorcycle, scooter, ATV and UTV inventory in Inland Empire and Southern CA. We stock used sport and dirt bikes, cruisers, dual-sport bikes, touring bikes and other types of used off-road and motocross vehicles.

Find used motorcycles from trusted manufacturers like Honda, Yamaha, Kawasaki, and Suzuki. We have a huge inventory of popular sport bikes such as CBR600RR, CBR1000RR as well as side by side utility vehicles from Polaris including RZR UTVs. Our great customer service doesn't stop after the sale. We service your motorcycle or ATV! Save time by scheduling your next service appointment online. We also sell parts and accessories online from all major OEMs and distributors 24 hours a day, 7 days a week. Mountain Motorsports also offers an OEM parts fiche from Honda, Polaris, and Suzuki, as well as aftermarket parts, gear, and tires from brands like Yoshimura, Fox Racing, Shift MX gear, Joe Rocket, Icon helmets and jackets, HJC, Bridgestone and Dunlop. If you are in SoCal, stop by Mountain Motorsports today! Southern California Bicyclist - #134 For over 20 years, SoCal Bicyclist has been THE source for comprehensive lists of events, clubs and news of interest to Southern California cyclists.

During that time, SCB was provided FREE to the public and continues today as a free periodical available in more then 1000 popular cycling locations and events throughout Southern California. for the latest bicycling action going down in SoCal. We hope you find our publications help you make the best of the time on your saddle wherever your bike takes you. 39 used & new fromSouthern California, 3rd: A Guide to the Classic Trails Series: America by Mountain Bike - Menasha Ridge Publisher: Menasha Ridge Press; 3rd edition (October 1, 2001) 9 x 6.1 x 1 inches Shipping Weight: 1.4 pounds #1,474,166 in Books (See Top 100 in Books) in Books > Sports & Outdoors > Individual Sports > Cycling > Mountain Biking in Books > Travel > United States > California > General in Books > Sports & Outdoors > Individual Sports > Cycling > Excursion Guides I paid for this and it was never sent. Please send me the book. Upon receipt, I will review it.

Not a fan of this book. Very limited selections, poor descriptions, and overall not good in my opinion.Los Angeles County: A Wide-Grin Ride Guide Where to Bike Los Angeles Mountain Biking: Best Mountain Biking around Los Angeles Mountain Biking Southern California (Regional Mountain Biking Series) Mountain Biking Southern California's Best 100 Trails Series: Regional Mountain Biking Series1st edition (May 1, 1999)T-Shirt Printing Euless 9 x 6 x 0.6 inchesHusky Puppies For Sale In Louisville Ky #1,093,982 in Books (See Top 100 in Books)Husky Puppies For Sale Near Columbus Ohio in Books > Travel > United States > West > Pacific in Books > Sports & Outdoors > Nature Travel > Adventure

Zinn & the Art of Mountain Bike Maintenance Should I run my mountain bike at the suggested PSI/Bar on the tire/rim? Or should I run it a bit lower? Or is it more about conditions? Should I run lower if I am running on softer terrain? Tire pressure is generally a trade-off between three things: Rolling resistance (more pressure == rolls easier) Pinch flat resistance (more pressure == less chance for the tube to tear when a rock squashes the tire toward the rim) Grip (with less pressure, the tire can conform better to rocks, roots, and other terrain giving a larger contact surface) If you are riding terrain where grip isn't too much of an issue (flat or low-angle dirt and dry rocks for example), then higher pressure will keep you going fast without pinch flatting. If you are riding steep downhills and/or on slippery open rock outcroppings, grip will be more important than rolling resistance, so use as little pressure as won't pinch-flat quickly. There is a 4th trade-off as well: weight.

You can buy double-sidewall downhill tires that allow you to run very low pressures (such as 25psi) without any danger of pinch-flatting, but these can weigh almost double what normal cross-country tires do. As mentioned in other answers, your tires don't have to be the same pressure. Usually grip is more important on the front tire since most of your weight is on it while descending difficult downhill sections. Similarly, when riding on flat or climbing, most of your weight is over the back tire, so rolling resistance and pinch-flat resistance are more important for the back. I personally ride with a low-pressure (30psi in a tire rated 35-65psi) double-sidewall downhill tire on the front and with a higher pressure (50psi in a tire rated 45-65psi) cross-country tire on the rear. I sacrifice some weight, but otherwise get the best of both worlds: fabulous grip going down and easy rolling on the flats and climbs. Use your best judgment in going below the rated pressure of the tire, as pinch flats become more likely.

If you go below the rated pressure, be sure to test it out on hard impacts (such as a rock-corner) on easy terrain before throwing yourself at high speed down a mountain where a blow-out would be catastrophic. Generally run what the tire says. If you know the terrain is slick rock or really loose and will require more contact between the tire and the surface then make them a bit softer. This will increase the chance of pinch flats though so be careful. I almost always run my front tire a bit softer than my back since most of my weight is on the back tire. Just something I've found that I prefer. It really depends on that the trails are like as well as your weight. If you are riding really flowy trails with few obstacles, jumps, or drops, you can probably ride a bit under 25psi if you are light. THis will give you significantly more traction and control. If you are riding trails with jumps and drops, you will want to air it up more. With rockier trails, you will want to ride at a higher psi to avoid pinch flats.

These are the kinds of trails that I typically ride and I usually go with 30 - 35 psi in the front and 35 - 40 psi in the back. I would say that you should run the lowest pressure you can without the tyre rolling off the rim on corners or burping on rocks. The assumption that harder tyres have less rolling resistance is not necessarily true, here is a study showing the opposite. [updated link, if it breaks again, search Google for "Rolling Resistance Eng Illustrated". The document was originally written by Schwalbe Tires] I agree with the other answers, but my strategy is to run the lowest pressure I can while consistently avoiding pinch flats. There's too many variables to come up with a general answer (bodyweight, trail type, tire manufacturer), but I find that something in the mid-30's is safe for me (200+lbs, xc race courses). If you want to play it safe, find a safe pressure and add 2-3 psi. Also, always check your tire pressure, taking the few minutes before most rides keeps you riding longer.

A tip my friend showed me at the weekend was to take to take a wheel and find a pointy rock. Lean all your weight gently onto the wheel. If the wheel doesn't hit the pointy rock then you're not likely to suffer from a pinch flat. If the rock easily touches the rim then the pressure is too low. This should account for a number of critical variables such as the volume of the tyre and the weight of the rider and the reasoning that you'll hit the rock at speed or on one wheel only (normally each wheel only takes 1/2 your weight). Some very good answers, but I think it's also worth saying that the sidewall gives a maximum not suggested pressure on all the bike tyres I've seen. The only time I ever run my mountain bike tyres at their maximum is if I'm riding on the road and in a hurry. None of the answers mention tubeless tires. A tubeless tires has no tube so no tube to pinch. The primary purpose of tubeless is for lower pressure. Need both tubeless rims (wheels) and tubeless tires.