cassette change
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cassette change
I have a Shimano 105 rear derailleur with a SRAM 12-26 cassette and triple crank. that I want to change. I have been out of cycling for a while and need alittle extra help with the hills until I get my legs back. What is the max size cassette i can use with the 105 Derailleur? I have been told 11-28 or 12-30. Any mechanics out there that can set me straight? Thanks.
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Originally Posted by operator
105 Long cage or short?
With 105 (or any other Shimano "road" RD), you might be able to get a 30T on there; depends on your frame. Try it. You'll have to adjust the B-tension screw to prevent the upper pulley wheel from rubbing on the largest cog -- if you can't adjust it far enough away, it'll rub the cog and the chain, causing premature wear on the drivetrain. But you can pick up a "mountain" RD (long cage, for triple, not because of the larger cog size) for relatively cheap. Look for Deore-level (that's roughly 105 equivalent).
Last edited by 'nother; 06-13-06 at 09:37 AM.
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What size are your chainrings? A typical 105 triple will have 52-42-30 chainrings. As an alternative you could possibly replace the granny chainring with something a bit smaller like a 28. Larger cogs will add weight, a smaller chainring will reduce weight.
Al
Al
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Thats a thought as well. My triple is the standard 30-42-52. I've seen chainrings as small as 22T. That might be a better choice than a new cassette. Thanks!
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Originally Posted by rick.seattle
Thats a thought as well. My triple is the standard 30-42-52. I've seen chainrings as small as 22T. That might be a better choice than a new cassette. Thanks!
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Originally Posted by rick.seattle
Thats a thought as well. My triple is the standard 30-42-52. I've seen chainrings as small as 22T. That might be a better choice than a new cassette. Thanks!
And yes you must have the correct BCD, 74mm.
Al
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I wasn't hinking of going to the 22T i just had seen them that small.
I just need a little extra help up the steeper hills so a 28 might work great.
What would the difference be between a new 28T chainring and a 12-28T Cassette?
I just need a little extra help up the steeper hills so a 28 might work great.
What would the difference be between a new 28T chainring and a 12-28T Cassette?
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Originally Posted by rick.seattle
I wasn't hinking of going to the 22T i just had seen them that small.
I just need a little extra help up the steeper hills so a 28 might work great.
What would the difference be between a new 28T chainring and a 12-28T Cassette?
I just need a little extra help up the steeper hills so a 28 might work great.
What would the difference be between a new 28T chainring and a 12-28T Cassette?
28 rear cog 30/28 X 27 = 28.93
28 front ring 28/26 X 27 = 29.08
Changing the granny chainring to a 28 and leaving the cassette at 12-26 is almost the same as changing the cassette to a 12-28 or something with a 28. Either way you'd get about a 7% lower gear.
If you need a bigger change you could try a 26 granny ring which will result in 27 gear inches.
Al
Last edited by Al1943; 06-13-06 at 02:57 PM.
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Generally a 2 tooth difference on the front will not matter as much as a 2 tooth difference on the rear, but in this case it comes out pretty close, slightly favoring a new 28T cassette:
current: 30 x 26 = 30.4 gear inches
proposed new chainring: 28 x 26 = 28.4 gear inches
proposed new cassette: 30 x 28 = 28.3 gear inches
both new: 28 x 28 = 26.4 gear inches
In any case, it's not *really* that much of a difference, even with both new cassette + chainring.
See https://sheldonbrown.com/gears/ to play with other ideas.
current: 30 x 26 = 30.4 gear inches
proposed new chainring: 28 x 26 = 28.4 gear inches
proposed new cassette: 30 x 28 = 28.3 gear inches
both new: 28 x 28 = 26.4 gear inches
In any case, it's not *really* that much of a difference, even with both new cassette + chainring.
See https://sheldonbrown.com/gears/ to play with other ideas.
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Originally Posted by rick.seattle
Thanks to all for your help!
I'm heading to the shop...we'll see what I come out with!
I'm heading to the shop...we'll see what I come out with!
If you go to a 46/34/22 or a 46/36/22 crank, you keep the same high gear but you still get the benefit of the small crankset.
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Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Last edited by cyccommute; 06-13-06 at 03:04 PM.
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Hey Rick, where are you in Seattle?
I have a 26 chain ring that I bought for my 105 Triple but never installed. I live near Alki and work 1/2 a block from Gregg's Greenlake. If it's easy to hook up, you can have the thing free. Better than going unused in a box in my garage. You just might need a set of washers/spacers but they're cheap.
PM me and let me know if you're interested.
I have a 26 chain ring that I bought for my 105 Triple but never installed. I live near Alki and work 1/2 a block from Gregg's Greenlake. If it's easy to hook up, you can have the thing free. Better than going unused in a box in my garage. You just might need a set of washers/spacers but they're cheap.
PM me and let me know if you're interested.
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I like the idea of changing the chainring. That way you keep the tighter cassette and you get the lower range that you need.
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I have successfully use an 11X32 cassett on both a 105 tripple and the Ultegra tripple. You will need a longer chain and adjust the B screw so the jocky wheels will clear the gears. This latter adjustment is one of the limiting factors in size of the gear.
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Originally Posted by cyccommute
If you go to a 46/34/22 or a 46/36/22 crank, you keep the same high gear but you still get the benefit of the small crankset.
Otherwise I like the idea.
Al