Prevent your next tire blowout
The last thing you want is a tire blowout the morning of your first triathlon!
Culprit: old tires
There are times when people use bike tires that are not very well maintained. The tire may have dry or weak spots. Mechanics/helpers/friends helping others get ready in transition during bike check-in will normally pump tires up to the maximum tire pressure. This exposes already weak, drily rotted, or damaged areas of the tire. This is the main culprit of tires blowing out.
Not a culprit: temperature change
A severe temperature change the night before will only cause a very slight change in tire pressure overnight. A swing of 50 degrees will be a shift of fewer than 10 lbs. of air pressure in your tire. Most wheel manufacturers’ rims can withstand more than twice the recommended tire pressure before the tire would pop off of the rim. So if your tire is supposed to be aired up to 120 lbs., chances are your rim can hold twice that amount of force or more.
Culprit: too little pressure
Begin the bike portion of your triathlon knowing your tires are completely aired up. Too little pressure will slow your ride down and make you work harder than necessary.
Rubber is a porous material. Tubes and tires will lose pressure over a short amount of time. Some tires will lose as much as 25 to 40 percent of their air in a week. If you air your tires up the day before you will probably have a little less air in your tires by race start. This would be a reason why you should air them up race day.
You can learn more about proper air pressure from this Jack’s Generic Triathlon blog post.
Want to learn more about flat tire prevention? Follow the advice in an earlier blog of ours.