Would upgrade be worth it?
Thinking about replacing the sunracer 12-32t casette that came with my bike to a tiagra 11-32t casette as its only $50 and would make the entire drivetrain tiagra. I've read that having your drivetrain entirely shimano tends to improve shifting but how noticeable would the difference be and would I notice much of a difference between the 12t and 11t high side? Basically I am curious whether it is a worth while upgrade or if the change would be barely noticeable.
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I'm guessing the 12-32 cassette is 10 speed and the 11-32 is 11 speed, which would make this not a viable path.
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No. Both are 10 speed. One is just the sunracer csr and the 11-32 is the shimano tiagra 10 speed. it replaces one of the single tooth jumps with a 2 tooth jump otherwise seems pretty similar throughout the gearing just ends up being +/- 1 tooth throughout the entire casette. here is a link to it. https://www.amazon.com/dp/B00WLFTGQQ...v_ov_lig_dp_it
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You will miss the 11t if you hammer down the hills. It will add a top speed deficit of about 3mph (or 5km/hr). I ride with two bikes my Giant has an 11-28, and my Trek has a 12-25. I am currently in the process of ordering an 11-28. An 11t cog will give you one more harder gear so you can mash your power going down hill vs spinning relentlessly. Just going down a relatively steep pinch my speed difference is about 27mph vs 30mph. It might not seem like much, but then you also have to account for the fact that I still have more power to put through that cog than what I need. With a 12t cog I don't have enough.
Bikes used to come with a 12-25 or even a 12-27 as standard 10 and 20 years ago, but 11-28 is just an infinitely better standard. There is even a push towards 11-32 as the standard now. However a 32t cog can lead to a situation where you're traveling at less than 4mph while going up hill. At which point you need to acknowledge that you might even be going slower than someone who is grinding up a climb. Unless the gradient is well and truly above 10% for a great extent of time you don't really need a 32t cog. |
The shimano one I am looking at getting has the 11t so I would gain 3mph. Sounds like that would be a beneficial gain.
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Originally Posted by cvictorh
(Post 20385001)
No. Both are 10 speed. One is just the sunracer csr and the 11-32 is the shimano tiagra 10 speed. it replaces one of the single tooth jumps with a 2 tooth jump otherwise seems pretty similar throughout the gearing just ends up being +/- 1 tooth throughout the entire casette. here is a link to it. https://www.amazon.com/dp/B00WLFTGQQ...v_ov_lig_dp_it
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Originally Posted by cvictorh
(Post 20385014)
The shimano one I am looking at getting has the 11t so I would gain 3mph. Sounds like that would be a beneficial gain.
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Originally Posted by 1500SLR
(Post 20385019)
You would gain around 3mph while going down hill and some extra power to push through the gear and pedal while going down hill. The difference with a 12t is that I get to around 27mph and feel like I'm starting to run the gear out of its puff. With an 11t cog its still got a whole lot more to give.
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Originally Posted by 1500SLR
(Post 20385009)
However a 32t cog can lead to a situation where you're traveling at less than 4mph while going up hill. At which point you need to acknowledge that you might even be going slower than someone who is grinding up a climb.
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Originally Posted by HTupolev
(Post 20385086)
If you're doing 4mph in a 32T cog on a current Tiagra drivetrain, on a road bike with 700c wheels, you are grinding. That's less than 60rpm even if you're in the smallest ring on a Tiagra triple!
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FWIW, my 12 tooth cog on my Tiagra equipped bike never slowed me down, at least to my knowledge. With a good wind I could ride at 30 mph, and I once drafted a truck at around 40, though my legs were spinning. Now I might be able to get a better short sprint on my 11, but not sure.
If I could go with a 12-32 eleven speed cassette with my derailleur, I definitely would. |
Originally Posted by cvictorh
(Post 20384986)
Thinking about replacing the sunracer 12-32t casette that came with my bike to a tiagra 11-32t casette as its only $50 and would make the entire drivetrain tiagra. I've read that having your drivetrain entirely shimano tends to improve shifting but how noticeable would the difference be and would I notice much of a difference between the 12t and 11t high side? Basically I am curious whether it is a worth while upgrade or if the change would be barely noticeable.
FWIW, I use a 12 - 27 cassette, and my big ring is a 48. I never once felt like I needed an 11 tooth, even at 35 to 40 mph, which is about my limit. On flats, I seldom even use the 12 tooth. |
Originally Posted by 1500SLR
(Post 20385019)
You would gain around 3mph while going down hill and some extra power to push through the gear and pedal while going down hill. The difference with a 12t is that I get to around 27mph and feel like I'm starting to run the gear out of its puff. With an 11t cog its still got a whole lot more to give.
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Originally Posted by MRT2
(Post 20385212)
How fast are you spinning? According to a gear inch calculator, at 90 rpm, on a 50 tooth big ring, you should be going 29.5 mph, and on an 11 tooth, 32.2 mph. So your 3mph speed difference is true, but frankly, you should be able to increase your cadence for short periods of time, and even if you can't, unless you are racing, 30 mph is pretty darned fast. When I get that fast, my instinct is to coast.
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Originally Posted by MRT2
(Post 20385212)
How fast are you spinning? According to a gear inch calculator, at 90 rpm, on a 50 tooth big ring, you should be going 29.5 mph, and on an 11 tooth, 32.2 mph. So your 3mph speed difference is true, but frankly, you should be able to increase your cadence for short periods of time, and even if you can't, unless you are racing, 30 mph is pretty darned fast. When I get that fast, my instinct is to coast.
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There's no need. My name is not Chris Froome. As to descending... Some people are madmen. They just want to go faster... I just want to go faster. 30mph is nothing much to me these days. I do it every other day down hill.
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Originally Posted by 1500SLR
(Post 20385252)
There's no need. My name is not Chris Froome. As to descending... Some people are madmen. They just want to go faster... I just want to go faster. 30mph is nothing much to me these days. I do it every other day down hill.
https://farm2.staticflickr.com/1743/...69937f91_o.gif |
Originally Posted by cvictorh
(Post 20385014)
The shimano one I am looking at getting has the 11t so I would gain 3mph. Sounds like that would be a beneficial gain.
How often do you use the cog you'd lose? Me, I hate wide gears. I'm happy to lose a cog at each end and get a couple more in the middle, because those get used all the time, and it means I can cruise at the highest speed possible for a given effort level instead of either spinning, grinding, or going slower. Also, 11t is poo - because it's so small it's more of a polygon than a circle, giving rise to chordal action - the crank rpm varies with each 11th of the wheel's rotation. If you want to go faster, bust out a bigger chainring. |
Not worth it, not noticeable.
Spent the money on better tires. |
Originally Posted by noodle soup
(Post 20385331)
You don't need Froome-like abilities to spin over 90rpms. I agree 30mph is nothing. I live in an area with very few hills, but still hit ~40mph on most rides. 30mph is what you hit in a radar speed-trap sprint.
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Originally Posted by 1500SLR
(Post 20385579)
There's main streets around here that are marked as 30mph. I just like to annoy all of the car drivers by taking a lane then riding as fast as them.
105 isn’t a very high cadence. |
Originally Posted by 1500SLR
(Post 20385579)
There's main streets around here that are marked as 30mph. I just like to annoy all of the car drivers by taking a lane then riding as fast as them.
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Originally Posted by noodle soup
(Post 20385331)
You don't need Froome-like abilities to spin over 90rpms. I agree 30mph is nothing. I live in an area with very few hills, but still hit ~40mph on most rides. 30mph is what you hit in a radar speed-trap sprint.
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Originally Posted by San Pedro
(Post 20386197)
Are you saying you regularly cruise at 30mph?
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Originally Posted by cvictorh
(Post 20384986)
Thinking about replacing the sunracer 12-32t casette that came with my bike to a tiagra 11-32t casette as its only $50 and would make the entire drivetrain tiagra. I've read that having your drivetrain entirely shimano tends to improve shifting but how noticeable would the difference be and would I notice much of a difference between the 12t and 11t high side? Basically I am curious whether it is a worth while upgrade or if the change would be barely noticeable.
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