Originally Posted by loulu
I got my first bike today since I was a kid. I don't know anything about bikes so I just bought the cheapest one I could find. Its a mountain bike. I'm fairly fit I run 5k three times a week. I went for my first cycle today and lasted about 5mins!! my butt hurts and my upper legs are in agony. I'm just wondering is it me or the bike? i thought I could do at least half hour for my first cycle. Now im not out of breath my legs just wont go! where am i going wrong.
1. Cycling uses your quads in ways which are different to what you experience when running.
2. In spite of this, your thighs shouldn't be in agony after only 5 minutes
3. This suggest to me that the bike hasn't been properly fitted to you. It may be that the saddle is the wrong height (most likely too low) or that the bike is the wrong size entirely. It may also be that the cheapest one you could find is not the best choice you could have made. If you bought it from a bike shop, go back and get them to fit it to you individually, properly.
4. If you weren't out of breath, that also suggest, to me, that you were in too high a gear. Legs dying but lungs not hurting is a classic sign of this. If you have any experienced (and knowledgeable) cycling friends, get them to check the way you use your gears. General principle is acclimatise to cycling by using lower (easier) gears and learning to spin the gears rather than pushing them
5. Butt hurting: cheap bikes save on components, including saddles. If shop bought, get them to allow you to try out different saddles, but only after they've set the bike up for your leg length, height, arm reach to handlebars, etc. Once that's done, you'll be able to assess whether or not the saddle needs changing, but if the setup isn't right, you won't be able to tell what's causing the undercarriage problem.
Ooops, just noticed your username and realise that you're probably a lady. Once set up, the choice of the correct saddle is even more vital to avoid pressure on the wrong bits.
Women's sit bones are generally wider than men's (ischial protuberosities if you want to google them) and if you're not supporting yourself on them, stuff that you don't want to squash gets squashed. Assuming that I'm right about your gender, it might be useful to log onto any women's cycling forum for advice. It's entirely possible that they'll be able to be more forthright (and accurate) than any of us (ladies excepted, of course).
Oh, and get some women specific cycling shorts, whether spandex or mountainbike so-called baggies
anyway, welcome to the cycling community. We are supportive, argumentative, agreeable/disagreeable, knowledgeable/not as knowledgeable as we may think, sane/barking people in a sane/barking world and anywhere on the spectrum in between any of the above.
Above all, seek out advice, test it to see if it is wanting and persevere.
Finally, take a look at Take a Class | League of American Bicyclists
and see if there's a Bikesmart instructor in your nexk of the woods. teh course will save you an awful lot of learning time