They make chainring spacers.
How I fitted a 770 middle ring on a 760 crankset. Pics!
For those with some skill and want a longer lasting middle ring to replace the older aluminium one on his 760 cranck, here it goes:
1-First had to lime down the spider a bit at the area shown in the pic.Just by hand and didn´t need to take more than 0.5mm off. That small aluminium rise wouldn´t let the flat part of the 770 ring rest properly.
2-Cut a 0.8mm polycarbonate sheet to desired shape.
3-Assemble!
NOTES: I´m not 100% sure a 0.8mm spacer is the right thickness. I just trusted my eye. Might be that a thicker one fits good too. If a thicker than 1.2mm doesn´t throw the ring way too inside it may be not necessary to lime down the spider, as the rising lid is no taller than 1,2mm, roughly.
Cheers!
1-First had to lime down the spider a bit at the area shown in the pic.Just by hand and didn´t need to take more than 0.5mm off. That small aluminium rise wouldn´t let the flat part of the 770 ring rest properly.
2-Cut a 0.8mm polycarbonate sheet to desired shape.
3-Assemble!
NOTES: I´m not 100% sure a 0.8mm spacer is the right thickness. I just trusted my eye. Might be that a thicker one fits good too. If a thicker than 1.2mm doesn´t throw the ring way too inside it may be not necessary to lime down the spider, as the rising lid is no taller than 1,2mm, roughly.
Cheers!
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