Going from compact double to standard double crank... what cassette?
09-24-11, 07:57 PM
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Going from compact double to standard double crank... what cassette?
If I was to go from a 50/34 compact double with a 11-28 cassette, to a 53/39 crank what cassette would you recommend?
I don't think I ever used the 34/28 but I would like to have a little help if I have to climb a huge hill and I'm dead tired. Also I don't think I would need the 11 with the 53 tooth?
I was thinking a 12-25 or 12-27? I'm also thinking of using a Shimano Ultegra cassette and Ultegra chain or KMC chain with my SRAM drivetrain... I heard it's a good combo.
I don't think I ever used the 34/28 but I would like to have a little help if I have to climb a huge hill and I'm dead tired. Also I don't think I would need the 11 with the 53 tooth?
I was thinking a 12-25 or 12-27? I'm also thinking of using a Shimano Ultegra cassette and Ultegra chain or KMC chain with my SRAM drivetrain... I heard it's a good combo.
Last edited by gobikego; 09-24-11 at 08:08 PM.
09-24-11, 08:00 PM
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If you don't already know the gear ratios you're after, I've got to ask . . . Why are you making the change in crankset? On the surface of it, if you don't need the 53/11, it seems you're only getting downside and no real benefit.
09-24-11, 08:15 PM
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I mean I have spun out with the 50/11 but only descending down and I can get close on flats if I really want to
This is just throwing around ideas for a build I'm planning, but I've never used a standard double, only compacts
This is just throwing around ideas for a build I'm planning, but I've never used a standard double, only compacts
Last edited by gobikego; 09-24-11 at 08:21 PM.
09-24-11, 10:11 PM
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If you're getting close to spinning out a 50/11 on the flats, you either don't know how to spin, or you should be getting picked up by a pro team by now (and you still don't know how to spin).
Nevertheless, play around with the Sheldon Brown Gear Calculator to see which gear combinations on a standard are equal to the ones you have on your compact. If you're not using the 34/28, see if you're using the 34/25 (equal to a 39/28) or the 34/23 (equal to a 39/26). Even if you don't need a higher top end, you can get a closer gear ratio by eliminating the cogs you don't use.
Nevertheless, play around with the Sheldon Brown Gear Calculator to see which gear combinations on a standard are equal to the ones you have on your compact. If you're not using the 34/28, see if you're using the 34/25 (equal to a 39/28) or the 34/23 (equal to a 39/26). Even if you don't need a higher top end, you can get a closer gear ratio by eliminating the cogs you don't use.
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09-24-11, 10:16 PM
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Cmon now. Spinning out a 50/11 on the flats is only about 45 mph, give or take. Everybody on BF can do that on their 75 mile daily rides.
09-24-11, 10:21 PM
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The OP should ask these guys what speed it takes to spin out a 50/11
https://www.youtube.com/watch?v=sVbwngNoHm0
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09-24-11, 10:54 PM
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It's not really a good thing due to my horrible riding style, ridiculous sprint for half a minute making my way up to the 50/11 and then just use that momentum to coast/not pedal for a while. I'm not the most consistent rider...
09-24-11, 11:13 PM
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Exactly. If you have a ride where you suspect you need a bailout, then put your 11-28 back on. Much easier than switching cranks.
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09-25-11, 06:44 AM
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If I was to go from a 50/34 compact double with a 11-28 cassette, to a 53/39 crank what cassette would you recommend?
I don't think I ever used the 34/28 but I would like to have a little help if I have to climb a huge hill and I'm dead tired. Also I don't think I would need the 11 with the 53 tooth?
I was thinking a 12-25 or 12-27? I'm also thinking of using a Shimano Ultegra cassette and Ultegra chain or KMC chain with my SRAM drivetrain... I heard it's a good combo.
I don't think I ever used the 34/28 but I would like to have a little help if I have to climb a huge hill and I'm dead tired. Also I don't think I would need the 11 with the 53 tooth?
I was thinking a 12-25 or 12-27? I'm also thinking of using a Shimano Ultegra cassette and Ultegra chain or KMC chain with my SRAM drivetrain... I heard it's a good combo.
09-25-11, 06:48 AM
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Ah. Then you should learn to ride and pedal before you go changing equipment.
09-25-11, 07:22 AM
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Now, on the flats 50x11 is quite fast. Even if you can only spin the cranks at 100 RPM (which just about everyone should be able to do with some practice) that's 35 MPH.
So what that tells me, is that spinning out to you is probably about 70 RPM, maybe 65. In other words, you need to work on your cadence. Get a cadence sensor and work on it. Then if you still want a new crankset, go for it.
Last edited by ErichM; 09-25-11 at 07:30 AM.
09-25-11, 08:43 AM
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He said he's planning a new build, not swapping out the crank on his existing bike. Therefore he needs to also make a cassette selection.
I'd go 12-27. Minimizes the unneeded top end, maximizes the bottom end, and doesn't have the missing middle gears that everyone deep down wishes their 11-28 had.
I'd go 12-27. Minimizes the unneeded top end, maximizes the bottom end, and doesn't have the missing middle gears that everyone deep down wishes their 11-28 had.
09-25-11, 08:49 AM
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^^^ I missed the new build part.
In that case the OP should play around with Sheldon's gear calculator and use it to find a cassette range with the high and low gears he wants and fill in the gears he likes. Place the ratios used most often toward the middle range of the cassette if possible.
In that case the OP should play around with Sheldon's gear calculator and use it to find a cassette range with the high and low gears he wants and fill in the gears he likes. Place the ratios used most often toward the middle range of the cassette if possible.
