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Changing Out Cassette on New Bike?

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Changing Out Cassette on New Bike?

Old 04-16-09, 10:14 PM
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5kdad
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Changing Out Cassette on New Bike?

I'm looking at a new bike to replace my older road bike. I have a good mt bike.
Living near the Arkansas Ozark Mountains, I often find myself creeping up a hill in my largest (32 teeth) rear cog. The bikes I'm looking at have 11-25 and 12-27 rear cogs.
Would it be feasible to have the bike shop change out to something like a 11-32 or even 11-34? Would this affect the performance of the shifting? Would I need to replace any other parts of the shifting mechanism? Would I be looking at much expense?
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Old 04-17-09, 12:46 AM
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It should be possible to change the gearing out.
The bike you are going to buy will have to be equipped with a 9 speed set up because the 32, 34 cassettes made for mountain bikes currently go up to 9 speed. If you were to buy a 10 speed bike you would have to change the shifters out for 9 speed shifters or use some type of cable adapter.
In addition to the cassette you will have to swap out the rear derailleur for a mountain Shimano SGS style unit and a longer chain. Most of Shimano's SGS rear derailleurs have a 45 tooth capacity.

For example: If the bike you are considering comes with a triple crank set with 50-39-30 gearing (20 tooth spread) and the rear cassette you wish to use is a 11-34 (23 tooth spread) then you have a need for a rear derailleur with a capacity with atleast 43 teeth. The SGS rear derailleurs handle a 45 tooth capacity so you'll be covered.
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Old 04-17-09, 06:22 AM
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Whatever the speed of your old MTB the new one must be the same if you are going to switch the cassette. You can find 7, 8 & 9 speet cassettes with a 32 or 34 gear. So the only thing is if you are getting a new cassette for the new bike then just get whatever the new bike is. However the rear derailleur might have to be changed depending on what the new bike has on it. Ingleside gave you a good example. The correct RD will give you good shifting.
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Old 04-17-09, 07:00 AM
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The choices depend on if the new bike is 9 or 10 speed. If 9 speed, a mtn bike cassette and RD and maybe a chain will work.That will cost about $100. For 10 speed, Harris has 11-32 cassettes but they are expensive and you will also need RD and chain. I expect the new bike will be a triple and you might try replacing the 30t small ring with a 26. In my experience this works better on some bikes than others and you may have to experiment. This is the cheapest solution, $20 for the chainring and $10 for a chain catcher if needed.
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Old 04-17-09, 08:49 AM
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Originally Posted by Ingleside View Post
It should be possible to change the gearing out.
The bike you are going to buy will have to be equipped with a 9 speed set up because the 32, 34 cassettes made for mountain bikes currently go up to 9 speed. If you were to buy a 10 speed bike you would have to change the shifters out for 9 speed shifters or use some type of cable adapter.
In addition to the cassette you will have to swap out the rear derailleur for a mountain Shimano SGS style unit and a longer chain. Most of Shimano's SGS rear derailleurs have a 45 tooth capacity.

For example: If the bike you are considering comes with a triple crank set with 50-39-30 gearing (20 tooth spread) and the rear cassette you wish to use is a 11-34 (23 tooth spread) then you have a need for a rear derailleur with a capacity with atleast 43 teeth. The SGS rear derailleurs handle a 45 tooth capacity so you'll be covered.
Very informative! Thanks.
One point of clarification. You say, "In addition to the cassette you will have to swap out the rear derailleur for a mountain Shimano SGS style unit and a longer chain."....Would that be the case if the new bike has a 9 speed set up, or is that only if the bike were a 10 speed?
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Old 04-17-09, 01:38 PM
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From one Arky to another, you have some options.
If I understand you correctly the new bike will be a road bike. Most new road bikes are equipped with 10-speed components. Shimano mountain bike cassettes are 9-speed only and will not work with 10-speed shifters. There is a company, IRD, that makes 10-speed cassettes with mountain bike gearing. Road rear derailleurs cannot handle 32 or 34 tooth cogs, mountain type rear derailleurs can. You can use a Shimano mountain bike rear derailleur with an IRD 10-speed cassette and 10-speed shifters and 10-speed chain. The shifters, cassette, and chain must all be either 10-speed or 9-speed.
Another option you should consider is a compact crankset. This is a double chainring crankset with 110 BCD chainrings that are smaller than traditional road chainrings. These are offered on many new bicycles. You could combine a compact double with a 12-27 road cassette and possibly have gearing low enough for the Ozarks, but that depends partly on your ability and also what part of the Ozarks you want to ride.
Another good option would be a triple crank with 50-39-30 chainrings and a 12-27 cassette, with that you should be able to handle the Ozarks. And I suspect that this would be the best choice for you.
I don't like mountain cassettes on a road bike because the large ratio jumps from cog to cog cause large cadence jumps at the pedals.
Where in the Ozarks do you plan to ride?
Soooo Pig!

Al
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Old 04-17-09, 03:12 PM
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Originally Posted by Al1943 View Post
From one Arky to another, you have some options.
If I understand you correctly the new bike will be a road bike. Most new road bikes are equipped with 10-speed components. Shimano mountain bike cassettes are 9-speed only and will not work with 10-speed shifters. There is a company, IRD, that makes 10-speed cassettes with mountain bike gearing. Road rear derailleurs cannot handle 32 or 34 tooth cogs, mountain type rear derailleurs can. You can use a Shimano mountain bike rear derailleur with an IRD 10-speed cassette and 10-speed shifters and 10-speed chain. The shifters, cassette, and chain must all be either 10-speed or 9-speed.
Another option you should consider is a compact crankset. This is a double chainring crankset with 110 BCD chainrings that are smaller than traditional road chainrings. These are offered on many new bicycles. You could combine a compact double with a 12-27 road cassette and possibly have gearing low enough for the Ozarks, but that depends partly on your ability and also what part of the Ozarks you want to ride.
Another good option would be a triple crank with 50-39-30 chainrings and a 12-27 cassette, with that you should be able to handle the Ozarks. And I suspect that this would be the best choice for you.
I don't like mountain cassettes on a road bike because the large ratio jumps from cog to cog cause large cadence jumps at the pedals.
Where in the Ozarks do you plan to ride?
Soooo Pig!

Al
I am right in the middle of the Eureka Springs and Harrison, AR and Branson, MO area. Live about 5 miles from the Missouri line. It's not terribly hilly in my immediate area, but I've ridden some in the Eureka Springs area. Get close to Table Rock Lake, and there's plenty of steep hills. I've also ridden south, down around the Buffalo River area.....Ponca, Boxley. There's some hills there that would give a pro a real work out!
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Old 04-17-09, 03:22 PM
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I'd go for the triple. The Shimano 105 10-speed has 50-39-30 chainrings. If you put a 12-27 cassette on it you'll be good to go.
I grew up in Siloam Springs but have lived in Tulsa, OK, most of my life. We drive to your area often, one of the most beautiful areas in the whole country.

Al
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Old 04-18-09, 03:49 AM
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Originally Posted by Al1943 View Post
I'd go for the triple. The Shimano 105 10-speed has 50-39-30 chainrings. If you put a 12-27 cassette on it you'll be good to go.
I grew up in Siloam Springs but have lived in Tulsa, OK, most of my life. We drive to your area often, one of the most beautiful areas in the whole country.

Al

Yes, it is a very beautiful part of the country. I used to joke with my family when driving around the area, "This would really be beautiful, if we didn't live here". We some times take it for granted and don't enjoy it like we should.
Guess that's one reason I enjoy biking.
A friend and I did a little tour last year, did a 6 day, 4 state loop your direction:
http://www.crazyguyonabike.com/doc/4286
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Old 04-18-09, 08:39 AM
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Get rid of the 30t in front and install a 24t with a chain checker. The 30 on the "racing" triple is a joke. The shift to the middle ring won't be as smooth, but it does work. I have installed them on my friends' bikes.
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Old 04-18-09, 10:08 AM
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I would recommend riding the bike first before investing too much money.

One of my customers bought a Specialized Roubaix triple, and due to reading too much on the internet, felt he needed the lowest gears possible. I swapped out the rear cassette for an 11-34, changed the rear shifter to 9-speed, LX rear derailleur and a new crankset that would accept a 26t chainring.

The end result was a bike that didn't shift as well as the original, was heavier, and when he took it on the Triple Bypass tour (120 miles, 10K elevation gain), found he had gears that were so low he had a hard time keeping the bike upright at the speeds they allowed on even the steepest climbs.

The real irony is that we didn't even get as low a gear inch as he originally wanted.
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Old 04-18-09, 11:35 AM
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5k, those tours look great. You might enjoy the tour across Oklahoma: http://www.okfreewheel.com/
The route takes advantage of the prevailing wind. One year it finished in Siloam Springs, Arkansas.
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Old 04-18-09, 11:39 AM
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Originally Posted by davidad View Post
Get rid of the 30t in front and install a 24t with a chain checker. The 30 on the "racing" triple is a joke. The shift to the middle ring won't be as smooth, but it does work. I have installed them on my friends' bikes.
I changed my wife's inner ring from a 30 to a 28 and now she has to be really careful to avoid throwing the chain off to the inside. I'll probably change it back. If you need a chain checker you've got a shifting problem.
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Old 04-18-09, 11:57 AM
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Originally Posted by 5kdad View Post
I'm looking at a new bike to replace my older road bike. I have a good mt bike.
Living near the Arkansas Ozark Mountains, I often find myself creeping up a hill in my largest (32 teeth) rear cog. The bikes I'm looking at have 11-25 and 12-27 rear cogs.
Would it be feasible to have the bike shop change out to something like a 11-32 or even 11-34? Would this affect the performance of the shifting? Would I need to replace any other parts of the shifting mechanism? Would I be looking at much expense?
The only thing that would need to be changed is the chain and possible rear derailleur, assuming you're slapping on the same amount of cogs as a replacement. You should narrow down your choices, test ride them then come back and ask for more advice if you need it.
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Old 04-18-09, 04:09 PM
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Originally Posted by Al1943 View Post
5k, those tours look great. You might enjoy the tour across Oklahoma: http://www.okfreewheel.com/
The route takes advantage of the prevailing wind. One year it finished in Siloam Springs, Arkansas.
I have a cousin who did that ride years ago. I'd love to do it, but June is just too busy of a month for me to be able to take off a week, doing portrait and wedding photography. I have signed up this year to do RAGBRAI for the first time.
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