# average cycling speed 12km/h

I am now in training for cycling. Long time didn't got into bike. I am using a 21 gear mountain bike with highest gear, and around 70 - 80rpm. What's surprise me is my average speed only 12km/h(recorded from strava) and 14km/h(recorded from mapmyride).

I was wondering whether i am using the wrong gear? I thought that the higher with the same rpm will move faster than a lower gear with same rpm.

12km/h is much slower than my expectation. I expect 70rpm would be 20km/h or more.

• It is slow, but everyone moves at their own pace. Select your gear based on the effort required to maintain a decent cadence (70-80 is good). If you feel you can put out more effort (over the distance you're doing) then use a higher gear. (Your highest gear would be the largest front sprocket and the smallest rear sprocket.) If the highest gear is not satisfactory, you can probably get the rear cluster changed for one with smaller cogs. Commented May 2, 2015 at 12:02
• Plugging typical tooth counts for entry-level hard tail mtbs into sheldonbrown.com/gears I doubt the gears themselves are the problem if you're really doing 70+ rpm (I'm assuming 28-38-48 chain rings, the smallest sprocket might be 12 to 15 teeth) Commented May 2, 2015 at 12:34
• @DanielRHicks i tested all the gear and pretty sure that left 3 right 7 is the hardest to pedal. Yup. I am able to maintain 70-80 rpm per hour for more than an hour but what i am uncertain that it is 12km/h a normal speed for full 21 gear for 70-80 rpm. Wondering if that is my cycling problem, or is it a problem with the bike or the app i use Commented May 2, 2015 at 12:37
• Get a stopwatch and measure yourself riding a mile or something, without traffic lights and stop signs. Then, calculate it out by hand if you think its the gps. But I doubt it is, and your cadence is lower than you think it is. Commented May 2, 2015 at 12:38
• @vincentsty strava and mapmyride will be using the same underlying gps data, so you can't dismiss that. Both will cheat you (possibly by different amounts) in tight turns, so try a straight line with a clear view of the sky (then it's easy to grab the distance of google or a map and time with a stopwatch). All that said though, I doubt the GPS is making that much difference. Commented May 2, 2015 at 13:01