Cassette choice - 11-23 v 11-28
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Cassette choice - 11-23 v 11-28
Postby lordbiggington » Tue Jan 22, 2013 9:44 am
When I bought my bike I ended up replacing the 11-23 SRAM Red cassette with an 11-28 SRAM Force. Main reason as I was about to do a week cycling through some hills in Tassie (approx 13,000m of climbing in 7 days). So glad I made that choice. Now I am back home and back to more 'regular' riding (mixture of commute, flat medium and long rides up to 150k, with a few shorter climbing rides thrown in occasionally). So the question is, what real benefit will there be on my longer flat rides by switching back to the 11-23 cassette (I understand the dis-benefit on those hilly days), I suspect that I wont really notice a significant change, either from more options through the middle of the cassette nor the diff between Red and Force components (the rest of the groupset is also Red). I have a standard size chainring.
Cheers
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Re: Cassette choice - 11-23 v 11-28
Postby zero » Tue Jan 22, 2013 9:47 am
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Re: Cassette choice - 11-23 v 11-28
Postby lordbiggington » Tue Jan 22, 2013 9:52 am
OK, thanks for the response - but again excuse the ignorant question - is that because consecutive gears are too close together for the more frequent changes of speed in 'regular' riding?zero wrote:I have an 11-21 on my road bike. I make a lot of double shifts in every day riding.
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Re: Cassette choice - 11-23 v 11-28
Postby RonK » Tue Jan 22, 2013 10:20 am
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Re: Cassette choice - 11-23 v 11-28
Postby m@ » Tue Jan 22, 2013 10:33 am
That said, it's more incentive to head for the hills
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Re: Cassette choice - 11-23 v 11-28
Postby GeoffInBrisbane » Tue Jan 22, 2013 11:07 am
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Re: Cassette choice - 11-23 v 11-28
Postby warthog1 » Tue Jan 22, 2013 12:00 pm
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Re: Cassette choice - 11-23 v 11-28
Postby zero » Tue Jan 22, 2013 1:35 pm
Yeah - I just don't make any use of the close ratios in traffic riding. The gears are effectively 0-20 in one gear, then a 2km/hr spread between gears thereafter - If I am strong enough to generally ride with a 21 bottom, then I am strong enough to push the next gear 20-30, and the gear after that 30-35, and then and only then I might make some use of close ratios, and doing each intermediate change singly would just be a lot of soft pedaling whilst it changed.lordbiggington wrote:OK, thanks for the response - but again excuse the ignorant question - is that because consecutive gears are too close together for the more frequent changes of speed in 'regular' riding?zero wrote:I have an 11-21 on my road bike. I make a lot of double shifts in every day riding.
It is however an awesome excuse for dropping a group on a climb. Sorry guys I've got a 21 on, I have to ride at 20. See you at the top!
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Re: Cassette choice - 11-23 v 11-28
Postby jimsheedy » Tue Jan 22, 2013 1:45 pm
I'll be putting the 25 back on ASAP.
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Re: Cassette choice - 11-23 v 11-28
Postby BrisVegas » Tue Jan 22, 2013 1:49 pm
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Re: Cassette choice - 11-23 v 11-28
Postby lordbiggington » Tue Jan 22, 2013 4:34 pm
I reckon I'll throw the 11-23 back on, I am using a removable link so I can just swap the chain and cassette out easily enough I guess.
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Re: Cassette choice - 11-23 v 11-28
Postby jimsheedy » Tue Jan 22, 2013 4:39 pm
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Re: Cassette choice - 11-23 v 11-28
Postby lordbiggington » Tue Jan 22, 2013 4:45 pm
Yep - I got a new chain put on when I went for the 11-28 (I had done 500km on the 11-23 when I go it swapped over and kept that chain as well). So I am learning some things about treating my new toy nicely.jimsheedy wrote:Just a tip. New cassette + New Chain.
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Re: Cassette choice - 11-23 v 11-28
Postby jimsheedy » Tue Jan 22, 2013 4:50 pm
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Re: Cassette choice - 11-23 v 11-28
Postby hannos » Wed Jan 23, 2013 8:35 am
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Re: Cassette choice - 11-23 v 11-28
Postby Marty Moose » Wed Jan 23, 2013 9:35 am
Sent from my MB526 using Tapatalk 2
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Re: Cassette choice - 11-23 v 11-28
Postby jimsheedy » Wed Jan 23, 2013 10:25 am
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Re: Cassette choice - 11-23 v 11-28
Postby danny the boy » Wed Jan 23, 2013 12:34 pm
m@ wrote:I switched from 11-25 to 11-27 (I think... maybe 11-28), and have found myself doing way more double-shifts on the flat and cross-chaining a fair bit. Feels as though there's a dead spot in the middle of the cassette where either chainring is either too high or too low, so I end up cross-chaining often.
That said, it's more incentive to head for the hills
Thats very odd considering the only difference between an 11-25 and 11-28 is the 2 biggest gears.
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Re: Cassette choice - 11-23 v 11-28
Postby boss » Wed Jan 23, 2013 1:00 pm
I probably wouldn't shift to 11-25 as I like the 28 for the really tough hills. Although if you do less hills riding than me (self confessed mountain goat) 25 would be a sensible choice.
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Re: Cassette choice - 11-23 v 11-28
Postby lordbiggington » Wed Jan 23, 2013 1:35 pm
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Re: Cassette choice - 11-23 v 11-28
Postby mitzikatzi » Wed Jan 23, 2013 2:48 pm
This chart shows the cog breakdown on our various sizes of cassettedanny the boy wrote:m@ wrote:I switched from 11-25 to 11-27 (I think... maybe 11-28), and have found myself doing way more double-shifts on the flat and cross-chaining a fair bit. Feels as though there's a dead spot in the middle of the cassette where either chainring is either too high or too low, so I end up cross-chaining often.
That said, it's more incentive to head for the hills
Thats very odd considering the only difference between an 11-25 and 11-28 is the 2 biggest gears.
You need to look at each of the cogs between the two extremes.
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Re: Cassette choice - 11-23 v 11-28
Postby boss » Wed Jan 23, 2013 3:32 pm
These pages display the cogs that Shimano use for their 105, Ultegra and DA 10spd gear:mitzikatzi wrote:This chart shows the cog breakdown on our various sizes of cassettedanny the boy wrote:m@ wrote:I switched from 11-25 to 11-27 (I think... maybe 11-28), and have found myself doing way more double-shifts on the flat and cross-chaining a fair bit. Feels as though there's a dead spot in the middle of the cassette where either chainring is either too high or too low, so I end up cross-chaining often.
That said, it's more incentive to head for the hills
Thats very odd considering the only difference between an 11-25 and 11-28 is the 2 biggest gears.
You need to look at each of the cogs between the two extremes.
105 5700: http://www.shimano.com/publish/content/ ... _road.html" onclick="window.open(this.href);return false;
Ultegra 6700: http://www.shimano.com/publish/content/ ... ype-..html" onclick="window.open(this.href);return false;
DA 7900: http://www.shimano.com.au/publish/conte ... ype-..html" onclick="window.open(this.href);return false;
The cog teeth listed are substantially different to the erroneous data on the link you've posted.
As stated previously by Danny, on 11-25 and 11-28 all cogs are the same with exception of the biggest two.
It goes 11-12-13-14-15-17-19-21. Then 11-25 finishes with 23t and 25t, 11-28 finishes with 24t and 28t.
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Re: Cassette choice - 11-23 v 11-28
Postby mitzikatzi » Wed Jan 23, 2013 3:35 pm
I still think you need to look at the individual cogs as well as the overall range when choosing a cassette.
And SRAM is a little different. The differences are a little greater when you go from 11/25 to 12/28
11-12-13-14-15-17-19-21-23-25,
11-12-13-14-15-17-19-22-25-28
12-13-14-15-16-17-19-22-25-28
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Re: Cassette choice - 11-23 v 11-28
Postby kosh » Wed Jan 23, 2013 6:49 pm
personally I use an 11-28 for training and recreational events, but generally race on 11-23 (unless very hilly). oh and on a kurt kinetic I use a 12-21 straight block
if you have an 11-28 there are indeed some big jumps. one thing you can do is train to have a wider effective cadence range. on coach's advice I do fixed gear work at very high revs (like, 150rpm+) and this has developed a tolerance; on the road, my legs now feel as comfortable at 115rpm as they do at 85rpm.
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Re: Cassette choice - 11-23 v 11-28
Postby HiChris » Sat Jan 26, 2013 5:07 pm
One day I may get strong (man) enough for a full crank but I would probably run a 12-28 on if I did.
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