Fat Bike Tire Pressure 101: How to Select the Correct Air Pressure for Fat Biking
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Tire Pressure for fat biking can be quite the adventure when you’re first starting out. It seems like everywhere you look someone has a different opinion. A regular bike pump won’t even register pressure below 10 psi. So how do you even know where to begin? In the world of fat biking the answer can be complicated.
First, there’s a huge difference between having tubes in your tires or going tubeless. Believe it or not the giant tubes help to support the sidewalls of the tire a bit. Fat bike tire tubes are very durable compared to regular size mountain bike and don’t seem to be effected by "snake bite" style punctures. You’ll notice the difference if you go from tubes to tubeless when airing up your tires. It seems that tubeless tires need a little more air pressure to keep shape.
That being said, it’s important to experiment with different tire pressure whenever possible. The more you know how they feel at varying amounts, the more easily you’ll be able to select the correct pressure for your rides in the future. Go to high and you’ll be bouncing off of everything. Go to low and you’re bound to get a nasty rimshot. Not to mention the extreme rolling resistance you get when going too low.
I have gone over unpacked snow and loose sand with 1-3 psi. While you can ride over anything like that with super low tire pressure, the rolling resistance is almost 100%. Meaning every pedal stroke only moves you a short distance before you come to a full stop. Not too fun, but great for exercise and training.
I recommend that you purchase an air pressure gage that is designed for low pressure. Here’s the reliable one I use and recommend as it's small and packable. Meiser Presta It’s very portable and gives readings for fat bikes and mountain bikes up to 30 psi. It’s designed to fit a Presta valve. With a gage like this you can really hone in tire pressure for fat bikes. 12 psi in the fat bike world is actually pretty high believe it or not. Couple this gage with a small handheld air pump and you can experiment while out on the trail (of course the small size pump will take a little extra effort to inflate fat bike tires).
Average weight rider of 170 lb. - For a good starting place use the chart below. *Use a little more air for heavier riders:
- Loose sand: 4-6 psi
- Wet packed beach sand by the surf: 6-8 psi
- Rocky trails: 6-10 psi
- Pavement: 10-12+ psi (Most fat bike tires have a max psi of 20)
- Fresh snow: 1-4 psi (Everyone has a tough time with fresh snow so don't worry. Fat bikes really need packed snow)
- Packed snow trail: 2-6 psi (Packed non-cross country ski trails that are shared with hikers)
- Groomed snow trail: 1-4 psi (So you don’t sink in and damage the trail)
The above chart is a great starting off point and should get you confidently riding a variety of terrain in no time. Doing a "squeeze check" with your hands on the tires will help you learn to air your tires without a gage. It's more about feel than anything for fat biking tire pressure. I prefer to ride with a little more pressure in the back tire since that's where my weight is. The front tire I like to be softer so it has some shock absorbing properties.
In general, your fat bike will let you know if you have the wrong tire pressure. If you go too low then the sidewalls of your tires won't hold up and you will be out of control while riding around even the smallest turns. Plus, you will begin to experience "auto turn" where the fat bike can't maintain a straight line and goes where it wants to. Just get out there and experiment with different tires and tire pressure, try tubeless if you can and just have fun learning. You'll be an expert in no time! For more fat biking tips and information check out the Fat Bike Asinine Youtube Channel and subscribe today.
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