Thank for your fast reply … the download link to the Pro BMX Skills ebook works well! I went through the pages quickly and it is very interesting. It’s very difficult to find this kind of book in France.
I had a question/observation … I’m very surprise by the gearings recommended in the book. For example, the book recommended 40/16 for junior and in France it’s common to have 37 or 38/16. Why this difference?
First, thank you for buying Pro BMX Skills. It’s the greatest book nobody’s heard of.
Check out this chart from the book:
Adult BMX bikes often come with 44/16 gearing.
Junior gearing is typically closer to 40/16 (or 37/14), which is a bit lower — but not much lower.
At big bike companies, component choices are less about what’s ideal for each rider and more about:
• What can the bike company get at high quantities?
• What can the bike company get at low prices?
• Which parts can be used on numerous models?
From Pro BMX Skills:
LIMITATIONS OF STOCK GEARING
At the bike-company level, gearing choices are not about power and spin. They’re about cost and availability. For example, Toby Henderson of Intense BMX says he can’t buy a 43-tooth chainring in bulk, but he can get 42s all day long at a good price.
What’s why aftermarket companies like Sinz Racing and Profile Racing are so useful. They can make every size in every bolt pattern and color.
Less [gear] is more [speed]
I think most kids’ bikes are over geared. Just watch all those groms mash their pedals.
Easier gears (like your 37/16 or 38/16) seem like a good idea because:
• Less strain for young bodies.
• Faster starts.
• Teach them to spin faster.
• When they get going fast, they should focus on pump.
I usually ride/race BMX on a Specialized P3 dirt jump bike with a 1×10 Shimano XT drivetrain. I have my pick of gear ratios, and I use much less gear than a typical BMXer.
This gives me a better start (with less strain on my old body). Once I’m out of the gate, it’s all about pump, high-rev spinning and some sneaky MTB-style cornering (lots of details in Pro BMX Skills).
Have fun out there,
Know more. Have more fun!
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