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I've been really struggling learning to ride fakie (backwards) on my BMX. Tonight, an idea occurred to me. If I remove the chain from my bike, it'll be a "free coaster," and I won't have to pedal backwards while riding backwards, so I can focus entirely on balance and maintaining speed. I don't know if removing the chain would actually be very helpful, though I'm sure it would be fun and I'd learn some things. Is there any chance it would be harmful to the bike?

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    "Is there any chance it would be harmful to the bike?" - no – user4035 Aug 16 '17 at 7:32
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    @user4035 just post it as an answer. Even after thinking about it for a while I fail to see how it can be anything else. Btw people have this idea all the time, recent example: reddit.com/r/bmx/comments/6t7tyg/… – stijn Aug 16 '17 at 7:44
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    The pedals will spin about easily and could crack you in the shins when you're not expecting it. You could remove pedals too, making the bike effectively a balance bike. – Criggie Aug 16 '17 at 13:01
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    David pretty much answered this, but I want to add that making it a free coaster won't make fakies any easier. The reason you should learn it on a cassette is that it teaches your body how to move while back pedaling/fakieing (this keeps the balance). Until you have the muscle memory built, it's going to be pretty hard to fakie on something that doesn't rely on balancing through pedaling. – knocked loose Aug 16 '17 at 17:05
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    On a BMX you're going to be doing a lot of other things that are harmful to your bike. This is probably the least possible amount of harm you could do. – Wayne Werner Aug 16 '17 at 19:28
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What harm could it possibly do? The cranks are held firmly in place by the bottom bracket; the back wheel is held firmly in place in the drop-outs. The chain is completely non-structural: all it does is transmit power from the pedals to the rear wheel.

The only issues I can think of are

  • make sure you know how to remove and replace it, obviously;

  • I pretty much guarantee that you'll fall off at least once because of this. You know, as an intrinsic part of riding a bike, that putting forward pressure on the pedals has various effects and you use those effects subconsciously to control the bike. Now you're riding a bike where putting forward pressure on the pedals just spins them with no resistance. But, hey, you're practising tricks so I assume that falling off isn't a deal-breaker. :-)

Benedikt Mokroß adds

  • You're going to hit your knee on your stem a lot. Been there, done that.
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If you don't have a chain and don't have a chainguard, you're almost guaranteed to slip at some point and dig your chainring into your shins or ankles.

It's very painful -- both at the moment as well as later when trying to get the grease and grime out of the puncture wounds...

If you do decide to take off the chain, you might consider wrapping a very long athletic sock or some pipe foam around the chain ring to protect you from it.

Tl;dr it won't damage the bike but it might damage you.

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