Ask the Expert Bike Tech

It’s so nice to have friends with incredible talent and expert knowledge.  We already have the best Sport Nutritionist on the planet as a part of our Loving the Bike team, and now we pleased to announce the inclusion of Victor Jimenez…..World’s greatest Bike Tech.  I like to call him the Bike Guru.

You can now send in all your bike mechanic or bicycle fit questions to “Ask the Bike Tech“.  Consider Victor your own private bicycle expert.

Victor knows absolutely everything there is to know about the bike and how you and your bike can best work together.  He is the driving force behind Bicycle Lab, and Karma Bicycles; and an expert at understanding bicycles and how people interact with this machine.  Victor is a presenter for USA triathlon coaching certification and works with many coaches and athletes to improve technical skills on the bike.  He is also committed to helping the bicycle to become more utilitarian here in the US and worldwide. Victor is frequently seen riding his bike with his son and a trailer full of groceries.

Here’s a video from Victor himself welcoming you all to send in your questions:

We invite you to send in your questions for Victor, and he’ll respond with a wisdom packed video like the one below that he did for our viewer, Alex.

One of our Loving the Bike viewers, Alex Tran has been having knee problems that have prevented him from riding his bike.  Here is his question for our Guru and a video with how Victor explains how to solve the problem.

Knee Pain from Cycling

At the start of October, my friend gave me his clipless pedals and shoes (I had been using platform pedals). I used the clipless pedals and shoes for about an an hour, and had to stop, because my knees were in so much pain I couldn’t pedal.

I have since gone back to using platform pedals, but the knee pain hasn’t gone away. If I exert too much effort, even when in a low gear, it starts to hurt. If I climb a hill, it starts to hurt. 

I’m desperate for any solutions. I hate sitting around at home watching the weather get progressively worse, while all my friends are out enjoying the last few days of cycling season.

I can’t really pay for a $300 bike fit, but if I could I probably would have by now, since it might have helped. I went to my doctor and he said my knees were fine, but if they were, I shouldn’t be having this problem, right?

 Here is Victor’s response:

  • tom

    I have a 2010 trek 3700 with shimano m151 crankset… only used it for 3 months and gear teeth are gone and causing chain to jump and skip… I was told that I abused it… didn’t know there was a way to abuse a bike… any way im looking to upgrade to sugino xd600 crankset… do I need to change the bottom bracket or will it fit?

    • http://bicyclelab.com/ Victor

      Tom

      If you crossed the chain a lot it could wear the chainrings. Crossing is when you are in the big chainring and the largest cog in the back. This puts the chain at an angle and it literally shaves the teeth. It should be avoided. With a higher end crank and chainrings the same thing will happen. It may take a little longer but it will still happen.

      I talk about this quite a bit the my basic maintenance course.

      To answer your question though.

      First, I would strongly recommend that you stick with the shimano crank. The shifting will be better. You could however use the crank that you mentioned without changing the bottom bracket. From what I can tell your bike has the same length bb spindle as the one required by sugino.

  • Alex

    Hi Darryl,

    Well, my friend convinced me to go bike shopping. It was a nice flat ride for 15 miles, and my knee pain
    was minimal. It flared up again while I was walking around. I was able
    to buy Speedplay pedals, cleats, and shoes for $50, and the guy helped
    adjust it a bit for me. I used them on the ride back, and my knee pain
    was hardly noticeable at all! We had a heck of a time getting everything
    we bought home. Thanks so much for helping me out with my problem. I’m
    now loving my bike pain free ;)

    Alex

    • http://lovingthebike.com Darryl is Loving the Bike

      I’m so glad we were able to help you out with you issues.  Thanks for being a Loving the Bike reader and now an “Ask the Expert Bike Tech” satisfied customer.

  • Jake Renfrew

    I’m going to start putting some questions together right now.  Thanks Victor and Darryl.