Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance. Show Switching from Shimano 12-27 casette to 11-28 casette Member Thread Starter
Join Date: Sep 2012 Posts: 38 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 11 Post(s) Likes: 0 Switching from Shimano 12-27 cassette to 11-28 cassette Greetings, I need to replace my rear 10 speed cassette on my road bike. It's currently running a 12-27 and those cassette is becoming increasingly hard to come by. But 11-28 are readily available. My question is, * can i install 11-28T without having to lengthen the chain? thanks a bunch. Eric Last edited by ericleecw; 07-08-18 at 10:46 AM. Reason: Typo in title Senior Member
Join Date: Oct 2007 Location: West Yorkshire, United Kingdom Posts: 5,717 Mentioned: 5 Post(s) Tagged: 0 Thread(s) Quoted: 422 Post(s) [QUOTE=ericleecw;20435129]Greetings, I need to replace my rear 10 speed cassette on my road bike. It's currently running a 12-27 and those cassette is becoming increasingly hard to come by. But 11-28 are readily available. My question is, Quote: Originally Posted by ericleecw * can i install 11-28T without having to lengthen the chain? This shouldn't be an issue, your putting on a new chain with the new cassette? as this would be what most people do, rather than re-using an old chain with a new cassette! Quote: Originally Posted by ericleecw * will shifting still be smooth? Should make no difference to shifting (on the basis that it's the same brand) Quote: Originally Posted by ericleecw * do i need to readjust the rear derailleur? You will probably not, but till you fit it, it's an unknown Really Old Senior Member
Join Date: Feb 2007 Location: Mid Willamette Valley, Orygun Posts: 13,168 Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. Mentioned: 19 Post(s) Tagged: 0 Thread(s) Quoted: 1514 Post(s) In theory, your chain will need to be 1/4" longer. You 'should" have that much extra slack (1"+) but check. A simple way is to- When changing a cassette, expect to have to "tweek" the barrel adjuster 0-2 clicks. Last edited by Bill Kapaun; 07-08-18 at 11:25 AM. MotuekaCascadeChinook
Join Date: Jul 2017 Location: Mississippi Posts: 11,410 Bikes: Tarmac Disc Comp Di2 - 2020 Mentioned: 43 Post(s) Tagged: 0 Thread(s) Quoted: 4631 Post(s) The answer to all is maybe. There is a better than 50/50 chance I'd think, that all you need to do is install the cassette and you won't have to touch any adjustments. I might go ahead and change the chain anyway, The slightest wear of your chain will start the sprockets wearing quicker, though I've never had worn sprockets that required replacing. 28T is also the point where shimano recommends a different sizing procedure for the chain and there are different considerations for mountain bikes with rear suspension and road bikes as well as 2x and 3x fronts. The Shimano general operations manual gives the basics and probably is correct even for your older version of 105.
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Join Date: Dec 2006 Posts: 2,196 Mentioned: 16 Post(s) Tagged: 0 Thread(s) Quoted: 902 Post(s) Quote: Originally Posted by ericleecw Greetings, I need to replace my rear 10 speed cassette on my road bike. It's currently running a 12-27 and those cassette is becoming increasingly hard to come by. But 11-28 are readily available. My question is, * can i install 11-28T without having to lengthen the chain? Eric Your existing chain may be too short. You have to test. If it is too short, you run the risk that the first time you shift into the big/big ring/cassette combination that you tear the rear derailleur off of the frame, and it gets carried into the front derailleur, also tearing it off of the frame. Both will then get carried into the crankset, mangling it as well. Unless your frame is made of cast iron, the frame would be destroyed as well. Question: why do you want to reuse your old chain? You should be replacing the chain 3-4 times for every cassette replacement. If you don't remember the last time you replaced your chain, then it certainly needs replacement. Another question: why replace a 12-27 cassette with a less useful 11-28. Unless you are contesting finish line sprints at 60mph, the 11-tooth cog is useless. You're effectively losing one gear in your cogset. Derailleur adjustment: you may have to adjust the B-tension screw. Banned
Join Date: Jun 2010 Location: NW,Oregon Coast Posts: 43,599 Bikes: 8 Mentioned: 197 Post(s) Tagged: 0 Thread(s) Quoted: 7607 Post(s) Yea , piling on.. You should not put on a new cassette, so fit the new chain accordingly. Senior Member
Join Date: Jul 2002 Location: Sacramento, California, USA Posts: 40,770 Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur Mentioned: 68 Post(s) Tagged: 0 Thread(s) Quoted: 2912 Post(s) Replace the chain too. I use Sheldon’s big-big+1 method. Shifting should not be an issue. Senior Member
Join Date: Apr 2011 Posts: 3,597 Mentioned: 32 Post(s) Tagged: 0 Thread(s) Quoted: 2149 Post(s) Likes: 0 Miche and SRAM's cassettes are available in 12-27 and 12-28 and work perfectly with Shimano hubs and shifters. I wouldn't waste a gear adding an 11. Member Thread Starter
Join Date: Sep 2012 Posts: 38 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 11 Post(s) Likes: 0 Thanks all for the informative reply. I just installed a new chain last week and I just didn't have the time to order a new cassette until last night when I realize the 12-27T was hard to find. Senior Member
Join Date: Aug 2015 Posts: 2,101 Mentioned: 9 Post(s) Tagged: 0 Thread(s) Quoted: 1240 Post(s) May I suggest getting the 12-28 rather than the 11-28. The 10sp 11-28 has some big jumps in the low gear range. I think you should get a new chan as well. Advocatus Diaboli
Join Date: Feb 2015 Location: Wherever I am Posts: 7,953 Bikes: Merlin Cyrene, Nashbar steel CX Mentioned: 12 Post(s) Tagged: 1 Thread(s) Quoted: 4277 Post(s)
Quote: Originally Posted by Dave Mayer Another question: why replace a 12-27 cassette with a less useful 11-28. Unless you are contesting finish line sprints at 60mph, the 11-tooth cog is useless. You're effectively losing one gear in your cogset. Though with cross-chaining and depending on where it occurs for the OP's bike, the 11-tooth may make his 12-tooth usable when in the small chainring (if his 13 tooth was his original first usable small cog in small chainring with a 12-27 cassette). If originally his first usable was his 14-tooth, then the 11-28 will make his 13-tooth now usable (while in small chainring). Senior Member
Join Date: Aug 2005 Location: Pittsburgh, PA Posts: 33,404 Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here! Mentioned: 39 Post(s) Tagged: 0 Thread(s) Quoted: 1890 Post(s) Likes: 0 Quote: Originally Posted by Kontact Miche and SRAM's cassettes are available in 12-27 and 12-28 and work perfectly with Shimano hubs and shifters. I wouldn't waste a gear adding an 11. Shimano Tiagra 10-speed cassettes are also available in 12x28 or even 12x30. I agree that the 11-tooth cog is a useless gear for most riders. It's MY mountain
Join Date: Sep 2006 Location: Mt.Diablo Posts: 9,610 Bikes: Klein, Merckx, Trek Mentioned: 66 Post(s) Tagged: 0 Thread(s) Quoted: 3557 Post(s) Quote: Originally Posted by Dave Mayer Another question: why replace a 12-27 cassette with a less useful 11-28. Unless you are contesting finish line sprints at 60mph, the 11-tooth cog is useless. . Hardly useless. 50x11 is 39mph at 110rpm. Lots of average riders enjoy pedaling 40 mph down long 2-3% grades. Last edited by DiabloScott; 07-09-18 at 09:18 AM. MotuekaCascadeChinook
Join Date: Jul 2017 Location: Mississippi Posts: 11,410 Bikes: Tarmac Disc Comp Di2 - 2020 Mentioned: 43 Post(s) Tagged: 0 Thread(s) Quoted: 4631 Post(s) I'm glad I have my 52x11. I use it regularly on the slightest down grade. For certain I like having something to give just a little resistance to my leg muscles as I go down any hill as coasting makes my legs harder to get going again at the bottom. Thread Thread Starter Forum Last Post Princess_Allez Road Cycling 36 08-23-19 05:18 PM lonetoe Bicycle Mechanics 11 03-20-16 11:55 PM mrblue Bicycle Mechanics 4 09-25-15 07:10 PM escarpment Bicycle Mechanics 14 09-29-12 06:00 AM vincejohnston Bicycle Mechanics 13 07-31-10 06:09 AM You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off Are all 10 speed Shimano cassettes compatible?All Shimano and SRAM cassettes up to 10 speed are broadly compatible. They all use Shimano's Hyperglide II freehub body spline pattern. Cassettes with the same number of sprockets have the same sprocket spacing, sprocket width and overall width.
What is Shimano HG50?The Shimano CS HG50 10 speed cassette is a high quality Dyna Sys 10 speed cassette. It features close ratio gearing which allows a more efficient use of energy through finer cadence control and sprockets are cut away and drilled to reduce weight without reducing rigidity.
Are 9 and 10 speed cassettes interchangeable?Interestingly, the reverse is not always true; you cannot use a 9 speed cassette on all 10 speed hubs. Shimano's 10 speed specific hubs are only designed to be compatible with 10 speed cassettes and, as with most computer programs, downward compatibility does not work as well as upward.
Are Shimano 10 and 11 speed cassettes the same width?No, 11speed mountain cassettes are slightly wider than 10/9/8 speed ones, so newer Shimano free hubs come with a small spacer (only 1 or 2 mm) so they're still compatible with older drive trains.
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Shimano 12 27 10 speed cassette
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