+BikeBill Posted December 11, 2013 Share Posted December 11, 2013 I wanted to get some spare O-Rings to replace the missing ones on the Bison's I keep finding with the seals missing. I wasn't sure what size to get. I have an assortment kit (of fractional sizes) but nothing seemed to be a perfect match and there were only a few of each size. Keep in mind this is for what I would call a 'standard' Bison tube. The bison's I have measure 14mm (or about 9/16") outside diameter. I ordered a pack of 50 Viton (good stuff) O-rings from eBay for about $6 and they are a great fit. What I ordered was 11mm inside diameter with a 1mm cross section. If you see metric O-rings listed as 2mm cross section, they are a bit too fat and probably aren't metric anyway, they are probably 1/16 inch. Hope this saves someone some research. Quote Link to comment
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