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| *Vultures Knob>>>Dirt Bike |
What size single chainring? |
Hi! What front single chainring size would be best to use for a hardtail (cannondale chase) frame with an 11-30T 8speed cassette at the rear and 175mm long crank arms; the bike is to be used for dirt jumping, xc, occasional downhill and general purpose riding. I think my options are between 32,34,36 or 38 Teeth chainrings. This is for riding use in England (around the south downs) by the way! Could someone please tell me what has worked for them or what would/should be best - Thankyou please! 32 is about standard. Allows for a really low granny gear. For what you said you are going to do, you do not even need a small ring. I can't even begin to tell you the last time I used mine. If you are going to do a lot of steep climbs stay low, if not go with the 36. Middle ring climbs are better for your leg strength too. Good luck. Don't get to techy, just ride and feel it out for yourself. I ride in the South Downs too, around Arundel and Worthing. I use 34 tooth mainly and find it quite comfortable for a 57 year young cycle maniac!! As for the rest of the tech bit- ain't got a clue cos I ain't bothered as long as I get where I want to go without breaking my back. Usually I just break wrists when I land wrong!!! I'd go with the 38. If you have an 11-30 rear cassette you'll be able to climb anything. Anything lower and you'd be spinning out. I ride a 39/16 fixed gear with 170mm cranks. That get's me over over most minor hills and allows me to ride a decent pace on the flats. Besides the answers already available, all great by the way. Proof that cyclists are awesome! Chainrings are so cheap (compared to other things), just go with one, feel it out, and change it if you aren't happy! Maybe start with the 34, and bump it up if you are spinning out too much. England? Oh my! None of that gearing is low enough. So, given the options, I'd certainly pick the 32t chainring. For the slightest chance for a 32t chainring to provide low-enough gearing, I'd boost that rear cassette to an 11-32 or 11-34. In fact, an 11-34 might let you risk a 34t chainring, but I wouldn't do it personally. You should also seriously consider transporting a grandma gear on the inner side of that crankset. Even if there's no derailleur to operate it, once you start a walk up one of England's more-famous hills, there's ample time to reach down and flip the chain onto the small ring. ;) If you're sure never to go on the "scenic" hills, you can use a chainring that is 2t larger than your lowest gear. Thus an 11-34 rear cassette can get you up to 36t chainring. Minimum low gearing for the hills is 1:1 for the 26" wheel bike or even lower for the 700c bike. 34 on 34 is a good bet. 32 on 32 works just fine too. Anything on 30???? Not enough. |
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