When the o-rings are worn, you do not have to dismount the idler.
Just cut out the old o-rings and pull the new ones over the idler flanks. Done!
You need 4 o-rings for the idlers with 11 and 19 teeth and 2 o-rings per idler for all other sizes.
Dimensions:
11 teeth 4 pcs. 34x2mm
12 teeth 2 pcs. 34x4mm
14 teeth 2 pcs. 42x4mm
16 teeth 2 pcs. 50x4mm
19 teeth old 4 pcs. 66x2mm
19 teeth new 2 pcs. , not available
21 teeth 2 pcs. 72x4mm
23 teeth old 2 pcs. 78x4mm
23 teeth new 2 pcs. 78x3mm
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