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+--- Thread: Bicycle Mechanics: Questions about Bicycle Rear Cassettes (/showthread.php?tid=76652)
Bicycle Mechanics: Questions about Bicycle Rear Cassettes - kap - 04-19-2009
The advantages and disadvantages between the rear Cogs 9-speed, 11-28 teeth and the 9-speed, 11-30 on a 2008 Giant FCR 1 Road/Sport? TiA
Re: Bicycle Mechanics: Questions about Bicycle Rear Cassettes - Buzz - 04-19-2009
you'll be able to climb a slightly steeper hill w/ the 30 than the 28...
though if you never climb that slightly steeper hill, you'll be lugging around a few extra grams of weight w/ the 30...
which will burn more calories and make you fitter, and/or tire you out ever so slightly sooner.
frankly, not sure which are the advantages or disadvantages; though wish I could I could ride again (the memories from 15 years ago haven't faded...)
Re: Bicycle Mechanics: Questions about Bicycle Rear Cassettes - cyclemax - 04-19-2009
For a Road/Sport bike, and depending on the front gearing and your riding level, unless your climbing steep grades your shouldn't need a 30 and probably won't use the 28 much. I believe the Giant has a 34/50 Crankset. A 34/28 should handle most road situations.
Re: Bicycle Mechanics: Questions about Bicycle Rear Cassettes - btfc - 04-19-2009
To fully answer this question you need to look at a gearing chart. The answer depends on the size of your front chainrings, and the complete range of the rear cassette. More generally, the 30 tooth sprocket will be helpful if you live in a more hilly area.
http://www.geocities.com/SiliconValley/Port/2945/Gears/Gears.html
http://home.i1.net/~dwolfe/gerz/howto1.html
http://www.panix.com/~jbarrm/cycal/cycal.30f.html
Check into half-step gearing.
Re: Bicycle Mechanics: Questions about Bicycle Rear Cassettes - kap - 04-19-2009
I live in an hilly area. It's only 1/2 mile from the flat spot of the main drag to our place but it is quite steep. How steep? on a more expensive carbon fiber bike it would be a breeze. Now how do I determine its steepness?
btfc, thanks for those links. Great info there.
Re: Bicycle Mechanics: Questions about Bicycle Rear Cassettes - Black - 04-19-2009
Make sure you don't need to switch to a long throw derailleur for those extra teeth . . . I think I've got a 32 on my road bike.
Re: Bicycle Mechanics: Questions about Bicycle Rear Cassettes - kap - 04-19-2009
cassette SRAM PG-950 11-28T, 9 speed
chain Shimano HG-73
cranks Shimano FC-4550-S, Compact, 34/50