Front derailleur question

[Andy_R]

Measue your bottom bracket shell from side to side. If it's 73mm then you need a 2.5mm spacer on the drive side (assuming your front mech is the standard band on type). If its 68mm then 5mm on drive side and 2.5mm on non drive side. If your seatpost tube is oversized then you 'll have to play around with the spacers. What's basically happening is that your chainset isn't far enough out on the drive side.

Cross posted there!

 

[RecordAceFromNew]

I haven't used the spacers.
When I did put it together using the spacers the left hand crank wouldn't fit onto the bike so I took them off.

As I have indicated before, what one installs should be informed by what one has and had (unless one feels lucky... ). Knowing the new is an m590 is only part of the puzzle.

 

[Pauluk]

No problem Pauluk. It is tempting to see it that way, but since we are not talking about a chain wrapping around one sprocket but two, the way to visualise it, is unless the two sprockets are very different in size and the chainstay is very short, half the teeth (the ones facing the other sprocket) are not making any difference to the chain length at all. Hence for bicycle chain length estimation purpose every 4T for two (one pair of) links is generally an excellent approximation.

RecordAceFromNew, many thanks for your reply and explanation. Think I forgot to divide the sprocket difference by 2

 

[actonblue]

The derailleur is too high it needs to be 2-3mm above the chainrings.

 

[citybabe]

Hi guys. Thanks very much for your help I think I have managed to do it.

I've just got to make a smaller chain now

Thanks again

 

[daddyshambles]

wow that was brill. so many options and advice. excellent