Do I need a longer Bottom bracket?

[mtbdave]

Just fitted these Boone twist cranks, and there pretty close too the chain stay.

Is this too close?

 

[KermitGKona88]

I wouldn't risk it. I would use a longer bottom bracket.

 

[mtbdave]

I wouldn't risk it. I would use a longer bottom bracket.

As in I need a longer axle

 

[FluffyChicken]

That's like perfection.

I'd be more worried the middle cog is at the wrong rotation.

But what bb length is there now.
(and measure your centre ring distance from centre of frame) and how far is the drive side away.

 

[mtbdave]

That's like perfection.

I'd be more worried the middle cog is at the wrong rotation.

But what bb length is there now.
(and measure your centre ring distance from centre of frame) and how far is the drive side away.

You’ve lost me,
No idea what length axle is in at the min I haven’t got the tools too remove it.

Wrong rotation? I know the granny ring needs more spacers in it, no idea on how too sort that.

Thought it would be a straight swap!

 

[mtbdave]

This is the drive side gap too chain stay

 

[My_Teenage_Self]

measure the distance from the centre of the seattube to the centre of the middle chainring - that's your chainline measurement.

All About Bicycle Chainline

but, yeah, longer BB axle needed

 

[ishaw]

Personally I think it's too close to the chain stay, are the rings clearing the stays ok?

Wrong rotation of the middle ring is referring to the fact that the little tab you can see should be behind the crank arm, so it needs to be rotated/repositioned.

 

[mtbdave]

Personally I think it's too close to the chain stay, are the rings clearing the stays ok?

Wrong rotation of the middle ring is referring to the fact that the little tab you can see should be behind the crank arm, so it needs to be rotated/repositioned.

I have just fixed the middle ring so all ok, I noticed on the back of the rings 46-36-26 all line up so I guess it’s correct now.

 

[mtbdave]

Personally I think it's too close to the chain stay, are the rings clearing the stays ok?

Wrong rotation of the middle ring is referring to the fact that the little tab you can see should be behind the crank arm, so it needs to be rotated/repositioned.

Rings are clear of chainstay I have added 2 photos, not the easiest to photo