{"id":74,"date":"2009-04-26T19:41:28","date_gmt":"2009-04-26T19:41:28","guid":{"rendered":"http:\/\/nobugs.org\/lejog\/?p=74"},"modified":"2009-04-26T20:23:59","modified_gmt":"2009-04-26T20:23:59","slug":"chainrings","status":"publish","type":"post","link":"https:\/\/www.nobugs.org\/lejog\/?p=74","title":{"rendered":"Chainrings"},"content":{"rendered":"

Time for some high-geekery.\u00a0\u00a0 Whilst climbing big hills, I noticed an occasional crunchy-slippiness coming from somewhere on the bike.\u00a0 A quick application of the magic chain gauge<\/a> showed that the chain was indeed pretty worn, and the sprockets had gone a bit shark-tooth shaped.\u00a0 Since I’d already planned to get a new 22 tooth rear sprocket (for the hills), I augmented my shopping list with a new 20 tooth rear sprocket and a new chain and then set about trying to understand what the heck all these different kinds of chainrings were for, and which one I needed.\u00a0 Several hours later, and I think I now have a Clue – which I’m going to preserve here for Google and posterity.<\/p>\n

I’ll use this chainring<\/a> as an example, because it’s the one I’m going to buy.\u00a0 It’s a “Thorn 104mm PCD 4 arm reversible single chainring 3\/32 inch 46teeth”.\u00a0 Which all meant nothing to me when I first read it.\u00a0 But now I can explain!<\/p>\n