How do you determine

dfvcad said:

the correct size of handle bar for a road bike? I was using a sizing program on the web and it states that I need a 46 cm handle bar that seem to me to be a very wide bar. I am 5'8" and I use a size 45 jacket/sportcoat. My local bike shop states that I should use between a 40 to 42CM bar. Any help with this issue will be appreciated.

Unless you're sizing yourself scientifically -- like a time trialist looking to shave tenths, using a windtunnel and a pro fitter -- handlebar size is a simple matter of preference. Most road cyclists of average size are going to be running bars in either 42cm, 44cm, or 46cm, and there are subtle tradeoffs with each range.

Chiefly, you're going for comfort, and there aren't any rules there. Wider bars tend to offer a bit more stability, and conventional wisdom suggests they open your chest cavity a bit for easier breathing (something I've not noticed); bars that are too wide could cause discomfort in your shoulders or back. For those used to wider setups, narrower bars can contribute to twitchier handeling -- scary, but something you adjust to. Conversely to wider bars, they supposedly put you in a position which makes breathing more difficult... again, not something I've personally noticed. Some racers find the overall effect more aerodynamic.

Some basic fitting guides say that you should hold a pair of prospective bars up to your chest; the bar ends should rest just outside of your armpits. Whatever. If you're unsure, try something in 44cm. You'll likely decide it feels just fine. Expand or shorten the width in the future, and you'll likely find the change pretty tolerable too -- just different.

Good luck. Second opinions never hurt.

Measure from the bone that protrudes from both of your shoulder and based on that measurement, that is the approx. width of your handlebar. Good luck.

tanggoman said:

Measure from the bone that protrudes from both of your shoulder and based on that measurement, that is the approx. width of your handlebar. Good luck.

Although some trainers recommend using a slightly larger size handlebar because it tends to open up the chest and make breathing more efficient.

thanks for the info guys.🙂