With road bikes it is not as easy as just going by height, as these bikes are very important to have properly fit. A very basic road bike fit, or "sizing", includes taking measurements of your inseam, torso length, arm length, and flexibility (I've been fitting for over 2 years and have never once asked someone's height). In addition, a lot of people measure slightly between sizes, and the bike of your choosing may need a little bit of parts swapping to actually dial in your fit and riding position... ie minor stem length changes, different drop to the handlebars, fore and aft saddle adjustment, etc. I would highly suggest going into a local shop to have them fit you
a STEEL fat crusty boy road frame
MAYBE - , frame size has nothing to do with tire size. Style does, and if its a mountain bike, it will not work with a 27 (road racing) wheel and tire. Brakes will not fit.
Sorry "Choose" typed to fast thanks for your answers.
20.25 or 20.5 there both good for that height
If you want a mountain bike for trials, I would suggest any bike under 25lbs with non-curved tube frame, under 14 inch frame size.
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Tri bikes are available in different frame sizes, just as the other bike versions.
Bicycle sizing is very personal, and depends on many different dimensions of your body, not just your height. A reputable bike shop will be able to offer you a fitting service. This can ensure that you get the right size of bike, including changing certain parts of the bike if necessary.
It depends on the length of the chainstays on your frame.
Sort of. Most MTBs use 26" wheels while most road bikes use 28" wheels. Although a MTB frame will usually have room for 28" wheels with skinny tires you won't get rim brakes to line up. There are adapters available which lets you mount road-style caliper brakes on a frame intended for canti/V-brakes. or if your MTB frame have disc brake mounting tabs you can get a set of road-size wheels built up with disc brake hubs. Then there is the fork. Most MTBs come with suspension forks, which are pointless energy sappers on a road bike. Simply sticking a road bike fork on there will cause a serious change in geometry, so that's not advisable. Better then to go for a suspension-corrected rigid fork. Next is a question about what crank and what shifters you want to use. Road cranks have higher teeth counts, they do best when paired with road front derailers, which require road shifters to get the correct actuation ratio. Road bikes and MTBs tends to favor different cabling arrangements, which can cause some problems. Bottom line is that it is doable, but fairly pointless. There are plenty of traps you can fall into, and it'll never be a "real" road bike. Better then either to buy a road bike, or simply slap some slicks and a road cassette on your MTB and ride it as it is.
21 is probably the measurement in inches, which works out as 53 cm. Trouble is, there's no telling if this is the top tube length or the seat tube length. For a road bike, it's probably the seat tube height for a mid-sized bike. If it's seat tube for a MTB, it'd be a big bike.
A bike that is a 125 CC has an engine size of 125 cubic centimeters. A 125 CC bike is usually used for off road travel.
Depends on the size of the man. A 19" frame is generally considered suitable for a 5'9" - 5'11" person.