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How much crank arm chain stay clearance is enough?

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How much crank arm chain stay clearance is enough?

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flag StumpyJR
Posted: Feb 13, 2019 at 7:24 Quote
Recently build a 2011 p1 frame up with some deity vendetta cranks with a 6" spindle. On the drive side and non drive side i barely have any clearance, maybe like 2.5mm on each side. Is this enough or should I try to space it out a bit more? It doesnt seam to be rubbing under force currently but I havent really had a chance to put it through its paces yet.
flag cmc4130
Posted: Feb 14, 2019 at 9:03 Quote
StumpyJR wrote:
Recently build a 2011 p1 frame up with some deity vendetta cranks with a 6" spindle. On the drive side and non drive side i barely have any clearance, maybe like 2.5mm on each side. Is this enough or should I try to space it out a bit more? It doesnt seam to be rubbing under force currently but I havent really had a chance to put it through its paces yet.

If they don't hit, then it doesn't matter how close they are. I have had both BMX and MTB's where the crank arms came super close to the chainstays.

How is your chain line, though? It makes a massive difference if your chain is straight from your rear cog to your chainring/sprocket, and not even slightly diagonal. Unfortunately it's very common in the BMX world to have bad chainline, because can't adjust the position of a one-piece driver. With an MTB cassette hub, you can move spacers to get the cog in a good position.
flag StumpyJR
Posted: Feb 14, 2019 at 9:47 Quote
cmc4130 wrote:
StumpyJR wrote:
Recently build a 2011 p1 frame up with some deity vendetta cranks with a 6" spindle. On the drive side and non drive side i barely have any clearance, maybe like 2.5mm on each side. Is this enough or should I try to space it out a bit more? It doesnt seam to be rubbing under force currently but I havent really had a chance to put it through its paces yet.

If they don't hit, then it doesn't matter how close they are. I have had both BMX and MTB's where the crank arms came super close to the chainstays.

How is your chain line, though? It makes a massive difference if your chain is straight from your rear cog to your chainring/sprocket, and not even slightly diagonal. Unfortunately it's very common in the BMX world to have bad chainline, because can't adjust the position of a one-piece driver. With an MTB cassette hub, you can move spacers to get the cog in a good position.

Chain line is perfect with my hope hub
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