There s much more to understanding road bike frame sizing than effective top tube length stack and reach and choosing the right size is key to proper fit and handling.
Road bike tube stem length.
Stem length will vary with the design of the bike.
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The recommended wheel and tyre sizes should be.
It must also address the rider s comfort biomechanics performance needs and the steering and handling of the bike.
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.
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.
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.
Kids bikes will have smaller wheels usually 16in 20in or 24in and need smaller diameter inner tubes and tyres as will most folding bikes.
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.
Generally speaking stem lengths on road bikes vary from 80 to 140mm with 100 to 110mm perhaps the most common sizes.
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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.
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.
Shorter stems result in noticeably quicker and more responsive handling that is a definite advantage on technical singletrack and gravity riding.