Whereas road riders tend to choose stem length based solely on overall bike fit and positioning for off road riders the length of the stem is critical in determining how the bike handles.
Road bike tube stem length.
Shorter stems result in noticeably quicker and more responsive handling that is a definite advantage on technical singletrack and gravity riding.
Stem length will vary with the design of the bike.
So a 29 inch mtb tube will have the same diameter as a 700c road wheel while a 27 5 inch tube will be the same diameter as a 650b road wheel.
Generally speaking stem lengths on road bikes vary from 80 to 140mm with 100 to 110mm perhaps the most common sizes.
Please remember this chart is for ican carbon fiber wheels other manufacturer s measurements may differ.
This size specific approach goes a long way to getting you set up with the correct stem length providing you ve chosen the right size frame another area where a bike fit comes in useful.
The most significant thing while choosing a road stem is the length of the stem may be the key factor for overall fit of the bike.
It must also address the rider s comfort biomechanics performance needs and the steering and handling of the bike.
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Kids bikes will have smaller wheels usually 16in 20in or 24in and need smaller diameter inner tubes and tyres as will most folding bikes.
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Riders like to get a long small and aerodynamic position of the bike e g spirited racers can choose for a longer 1200 mm stem for optimum stretch.
Now you know the mysteries of tire valves you should have no problems with making sure you are running the correct valves for your rim depth.
Mountain bike tyre sizes are usually stated in inches.