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Presta Valve Stem
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 Stans No Tubes Universal Valve 35mm Presta Valve Stem w/ Remoavble Valve Core  US $14.99
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 Continental Race 28 700c 18-23 Road Bike Tube 60mm Presta Valve Stem US $18.31
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Prior to heading out on the trail on your mountain bike, make sure you have some essential items with you such as food, water, tools and supplies. Be careful to only take what you need or you will be carrying more weight than you want. If you plan correctly, a minimum of items will be all you need to be well prepared.
Of paramount importance is to have a spare inner tube along with a bike pump and three tire irons to facilitate removing the tire. Flat tires are a downer no matter when they happen, especially when you have a long walk back home, possibly running out of daylight. Make sure your spare tube has the correct valve type - either a presta or a schraeder. In the rare event that you suffer 2 flat tires, it's a good idea to carry a tire repair kit, or simply carry 2 spare tubes with you. It's always best if you do a dry run at home. It's much easier to learn to change a tire at home rather than on a muddy trail with daylight fading.
Mountain bikes are assembled with allen bolts, so it's important that you carry a set of allen wrenches. If you're concerned about weight they even come in durable plastic versions these days. Riding over rough trails all day can cause bolts to loosen or brake and gear levers to come out of adjustment. Another item to consider is a chain tool, in case your chain breaks or requires an adjustment.
Mountain biking is much more enjoyable and safe if you have adequate water and food. Powerbars or breakfast bars are good choices for maintaining your energy level. Nothing is worse than a long ride home when you are exhausted, as this can increase your risk of becoming injured. Carry a frame mounted water bottle or if you are so inclined, strap on a Camelbak, a wearable backpack bladder system. The advantage of the Camelbak is that it has storage for spare bike tubes and tools.
Be sure to dress appropriately for your ride. Remember that you will warm quickly soon after starting your ride, so wearing a heavy jacket just doesn't make sense. Light layers will work much better. If you're riding in cold temperatures, wear good quality riding gloves and riding specific socks as your hands and feet will feel the cold the most. Your local bike shop is a gold mine of information. They can suggest the best and most suitable gear for the area you will be biking in and the type of riding you plan to do.
For more informative articles on mountain bikes and mountain bike riding visit www.mountain-bikes-biking.com
How to Find the tire puncture?
You'll need to do a little detective work to find the puncture. To track down the source of the problem, follow these steps:
- Examine the inner tube by listening for a leak. If it doesn't have air, pump it up to a larger shape than round. With the additional air pressure, the leak may make a hissing sound as the air tries to escape.
- If you're having trouble listening for the leak, float your finger above the surface of the inner tube until you feel the flow of air escaping. If you've narrowed the source of the leak to a small area, but you still can't find the actual hole, apply a small amount of saliva to the tube. Bubbles will lead you to the source. If you don't want to gross out your riding partners by spitting on your tube, you can sometimes find a very small hole or slow leak by holding the tube near your lips. The lips are very sensitive and should feel the smallest amounts of air leaking out.
- If you're still having trouble finding the leak, submerge the tube under water. A stream of bubbles will be clearly evident after submerging the tube. When you remove the tube from the water, wrap it around your finger at the source of the leak or mark it so that you don't lose the location.
In some cases, a hard-to-find leak may be traced to a valve problem. This is one situation in which you may want to employ the saliva technique. Apply a few drops of saliva to the end of the valve to look for signs of air escaping. For a Schrader valve, you can try tightening the valve core. If this doesn't work, you may need to remove the core, put a few drops of oil on the spring, and reinstall the core. This technique requires a valve cap with a built-in valve core tool or a separate valve core tool, something you can buy at bike shop. If the leak is coming from a cracked or cut stem, you'll have to replace the tube. In the case of Presta valves, more likely than a leak is the valve breaking (because valves are fragile).
Valve leaks are hard to find when the tube is outside the tire because the tube usually has very little air pressure and leaks in the valve usually only show up when there is a lot of air pressure (that is, when the tube is sitting inside the tire and the tire is inflated to the proper air pressure).
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Presta Valve Tread???? Need to build a valve extender for my aero wheels?
I need to build a Valve extender to inflate the tires when I use my aero wheels, sometimes in the local bike shop dont have the tubes with the long stem. But I need the tread size and pitch so I can work on the internal tread for the extender.
You should be able to find ready made extenders at any decent bike shop. Even if you're an experienced machinist, it has to be quicker and easier to spend a couple bucks.
Genuine Innovations Proflate 16
Gas tyre inflator
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