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24 34 42 Chain Rings with 14-28 7speed Freewheel

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Icemanxxxv Offline
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Posts: 11
Joined: Jul 2012
Post: #1
24 34 42 Chain Rings with 14-28 7speed Freewheel
So my bike has the above listed ring and freewheel set I'm looking for a bit more road friendly set of gears. I ride mostly hardpack walking trails and roads. Some gearing suggestions from the peanut gallery welcome here! Any combinations or multiple combinations accepted!
Sep 1, 2012 05:19 PM
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nfmisso Offline
Veteran Member

San Jose, CA
Posts: 2,223
Joined: Jul 2010
Post: #2
RE: 24 34 42 Chain Rings with 14-28 7speed Freewheel
crankset on a budget:
http://www.amazon.com/Shimano-M131-Crankset-170mm-48/dp/B003ZMDJW6/
http://www.amazon.com/Shimano-Crankset-FC-A050-170-Chainguard/dp/B002K2GR76/

and you can spend a LOT more. You may or may not need a new BB - I would try with your present one first.

And this freewheel:
http://www.amazon.com/SunRace-7-Speed-13-25t-Free-Wheel/dp/B003RLE9X8/
MUCH better than any Shimano freewheel I have owned.

Nigel
Sep 1, 2012 06:58 PM
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RobAR Offline
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Mountain Home, AR
Posts: 725
Joined: Sep 2010
Post: #3
RE: 24 34 42 Chain Rings with 14-28 7speed Freewheel
I didn't follow Nigels suggested links but, he is not known for steering people in the wrong direction. Lower tooth count at the rear will give you a higher (faster) gear ratio and will be less expensive than replacing a crankset or individual chainrings, maybe.

Wheelies don't pop themselves. (from a QBP fortune cookie)
Sep 3, 2012 08:10 AM
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nfmisso Offline
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San Jose, CA
Posts: 2,223
Joined: Jul 2010
Post: #4
RE: 24 34 42 Chain Rings with 14-28 7speed Freewheel
(Sep 3, 2012 08:10 AM)RobAR Wrote:  I didn't follow Nigels suggested links but, he is not known for steering people in the wrong direction. Lower tooth count at the rear will give you a higher (faster) gear ratio and will be less expensive than replacing a crankset or individual chainrings, maybe.

With a freewheel it is somewhat expensive to get less than 13 in the rear; plus chain and cog wear increases.

The freewheels with 11t small cogs are 2 to 3 times the prices and require a special tool for removal.

Nigel
Sep 3, 2012 10:26 AM
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Icemanxxxv Offline
Member


Posts: 11
Joined: Jul 2012
Post: #5
RE: 24 34 42 Chain Rings with 14-28 7speed Freewheel
I want to change the bottom bracket from a cup and cone type to a cartridge style. If I order a new crankset would I just match the original cup and cone dimensions or do I need to take into consideration the new crankset matching the bottom bracket spindle length. I know the bottom bracket will have to match as far as square taper, but will the original spindle length have to be altered to match the new crankset to keep the chain line?
Sep 3, 2012 01:01 PM
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Bill Offline
Veteran Member

NY,USA
Posts: 2,765
Joined: Sep 2009
Post: #6
RE: 24 34 42 Chain Rings with 14-28 7speed Freewheel
Just measure your bottom bracket size from end to end in mm. Post your measurement here just to make sure before you order Smile .

Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Sep 4, 2012 10:59 AM
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nfmisso Offline
Veteran Member

San Jose, CA
Posts: 2,223
Joined: Jul 2010
Post: #7
RE: 24 34 42 Chain Rings with 14-28 7speed Freewheel
crank sets have recommended BB lengths - not always right for every application though.

I would strongly suggest that you purchase the new crankset, mount it on your current BB, see if it works okay, or you want to change the crankset position relative to the frame, measure what you have, and order a Shimano UN55 of the length that will work.

The M131 I suggested above, recommends 122.5 or 123mm BB; for my GT and my style of riding, a 115mm would work much better. Part of the BB choice is your style of riding - which combination of gears do you want to use the most. The 123mm BB with the M131 and 135mm OLD lets you use the smallest chainring with the smallest cog (8 speed); but the chain is overly bent with the middle chainring and next to largest cog at the back. I'll never use small to small, and would like to use the middle with all 8 cogs.

Nigel
Sep 4, 2012 04:26 PM
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