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From 11-34T 9-speed cassette to 12-30T 10-speed cassette

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From 11-34T 9-speed cassette to 12-30T 10-speed cassette

Old 10-17-13, 11:32 PM
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From 11-34T 9-speed cassette to 12-30T 10-speed cassette

I have a 2013 Trek 7.5 FX, which comes with an SRAM PG-950 11-34T 9-speed cassette. I am wondering if I can have it swapped with a closer-ratio, 10-speed cassette, such as a Shimano Tiagra 12-30T 10-speed one. I want to do it mainly because of the current gear ratio. I use 20-23-26T most often, and I feel the jumps between those cogs to be rather big. By contrast, the Tiagra 12-30 cassette includes 19-21-24-27T cogs. I'm hoping that by having more cogs in the roughly same range, I will be able to change gears more smoothly.

As for the granny gear (34T), I don't think I'll need it. The steepest hill I've climbed is a mile-long 7-percent grade, which I was able to ride up in 30T. Or should I keep the current cassette in anticipation of running into steeper hills before I get enough strengths?

Thanks in advance for your advice!
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Old 10-18-13, 01:16 AM
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The cassette will swap in, but you will also need a 10-speed derailleur and shifter. Sounds like you're strong enough for the 30t (and your FX has a triple up front anyway, right?).
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Old 10-18-13, 04:09 AM
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You should be able to find a 9sp cassette with closer gearing than what you have. Changing the shifter to 10 sp is a lot more trouble than it's worth.
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Old 10-18-13, 07:37 AM
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Harris has some custom cassettes-
http://sheldonbrown.com/harris/k7.html#9

Else, you could buy a 12, 13 or 14-X cassette and swap your own cogs.

Another option may be to replace your small ring with a 30T and go to a 12-27 cassette?

In hindsight, for Seattle, a triple up front would probably have made more sense than your double?

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Old 10-18-13, 09:23 AM
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Originally Posted by Erwin8r View Post
The cassette will swap in, but you will also need a 10-speed derailleur and shifter. Sounds like you're strong enough for the 30t (and your FX has a triple up front anyway, right?).
Actually, mine has a compact double (50/34T). Thanks for reminding me about the derailleur and shifter, though. I wouldn't mind replacing those parts, but that would add cost to the project.

Originally Posted by zacster View Post
You should be able to find a 9sp cassette with closer gearing than what you have. Changing the shifter to 10 sp is a lot more trouble than it's worth.
Thanks for the advice. I will try to find a 9-speed cassette like that.

Originally Posted by Bill Kapaun View Post
Harris has some custom cassettes-
http://sheldonbrown.com/harris/k7.html#9

Else, you could buy a 12, 13 or 14-X cassette and swap your own cogs.

Another option may be to replace your small ring with a 30T and go to a 12-27 cassette?

In hindsight, for Seattle, a triple up front would probably have made more sense than your double?
Thanks for the information. Yes, in hindsight, a triple chainring would probably come in handy here. So far, I've been able to handle all the hills I've ridden with 34T (F) / 30T (R), but who knows. There are a LOT of roads around here that I haven't explored.

Replacing my small ring with a 30T and going with a 12-27 cassette may be a good idea. I will put more thought into it!
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Old 10-18-13, 09:44 AM
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Universal Cycles has a good range of 9-speed cassettes at the Tiagra level, including 12-27: http://www.universalcycles.com/shopp...06&category=41
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Old 10-18-13, 10:30 AM
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I hesitate to point out the obvious, since I may have missed something, but the jumps from 21-24-27 are the same as the ones from 20-23-26. I concur with the recommendation to find a closer ratio 9spd cassette and not change out shifters (and probably cables), which would add considerably to your cost. The lower range of my Ultegra CS6500 12-25 9spd is 17-19-21-23-25. I pair that with a 46/30 chain set and have more range than I need at either end, and one/two tooth jumps in the middle. There is a 12-27 Ultegra CS 6500, but it goes 17-19-21-24-27, which leaves you with two 3 tooth jumps. The Tiagra cassettes range is probably similar to Ultegra.
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Old 10-18-13, 10:56 AM
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Originally Posted by daihard View Post

Thanks for the information. Yes, in hindsight, a triple chainring would probably come in handy here. So far, I've been able to handle all the hills I've ridden with 34T (F) / 30T (R), but who knows. There are a LOT of roads around here that I haven't explored.

Replacing my small ring with a 30T and going with a 12-27 cassette may be a good idea. I will put more thought into it!
You cannot run a 30t ring on your oem crankset. You'd need to go triple for that. As others suggested, I'd toss a closer ratio 9speed on there and see how it goes.
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Old 10-18-13, 01:20 PM
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Originally Posted by surreal View Post
You cannot run a 30t ring on your oem crankset. You'd need to go triple for that. As others suggested, I'd toss a closer ratio 9speed on there and see how it goes.
Okay, thanks. Mind elaborating on why I can't run a 30T gear on my crankset?

The problem I currently see with going with a closer-ratio 9-speed cassette is that I can't seem to find one that's got a 30T cog as the granny gear. I feel that going to 12-27 would be a big challenge for me. I _can_ handle the hills that I currently ride on with my 26T cog, but I'm pretty sure I'll run into a steeper hill that requires a 30T, if not a 34T.

Can I just swap the entire chainring with a something like a 46-30 double (if there is such a thing)?
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Old 10-18-13, 01:33 PM
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Shimano makes an HG50 cassette in an 11-30.
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Old 10-18-13, 01:54 PM
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If you do the math on your gear ratios, you'll find that as you get closer to 1:1, front to rear, the change in the ratio gets smaller. What this means is that you need a bigger jump (3 teeth) at the larger, lower gear, end to get an equivalent to a 2 tooth jump in the middle, or a single tooth at the small end. On the chart below the first column is #teeth , and then the gear inches for a 30 tooth and a 50 tooth chainring.

30 50
13 62 104
14 58 96
15 54 90
17 48 79
19 43 71
21 39 64
23 35 59
26 31 52
29 28 47
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Old 10-18-13, 02:16 PM
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Originally Posted by daihard View Post
Okay, thanks. Mind elaborating on why I can't run a 30T gear on my crankset?

The problem I currently see with going with a closer-ratio 9-speed cassette is that I can't seem to find one that's got a 30T cog as the granny gear. I feel that going to 12-27 would be a big challenge for me. I _can_ handle the hills that I currently ride on with my 26T cog, but I'm pretty sure I'll run into a steeper hill that requires a 30T, if not a 34T.

Can I just swap the entire chainring with a something like a 46-30 double (if there is such a thing)?
If you look at the 110BCD 34T chainring on your compact crankset, you'll see that the teeth are already very close to the bolts. You physically can't make the ring any smaller (well, 33T) without the two circles interfering with each other. A smaller BCD crank is needed to get smaller chainrings:


(Image from Fairwheel Bikes.)
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Old 10-18-13, 03:02 PM
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Originally Posted by Erwin8r View Post
The cassette will swap in, but you will also need a 10-speed derailleur and shifter. Sounds like you're strong enough for the 30t (and your FX has a triple up front anyway, right?).
*bzzt* ...kind of.

You can, and actually need, to use a 9sp der with a shimano 10sp road shifter (SL-4600, SL-R770), which is one less item to buy in this setup. Or, yes, OP will also need a 10sp rear derailleur if OP goes with a Shimano mtn 10sp shifter.

And a 10sp chain.
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Old 10-18-13, 03:46 PM
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count teeth on the cogs , tell us which one di you really miss so much

you want to spend all that money to gain?

after all "speeds", is just how many cogs are there, it says nada about the gear ratios

developed between the front crank , which turns rear , which turns wheel..

often there are redundancies of ratios , and/or overlapping range,

and there would be little point in adding a redundant gear ratio.


alternatively, I put a 2 speed planetary crank ( a 150% difference (ala 50-20t))

so the other IGH, a 3 speed, is used twice just 6 ratios , 1 cog 1 chainring.
doubleshift is easy..

that 50 30 would be something to only upshift at the crest of a hill..

[TA cyclotourist cranks made those really wide step pairings, possible]

Last edited by fietsbob; 10-18-13 at 03:57 PM.
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Old 10-18-13, 04:25 PM
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Thermionic explained the crank issue quite well. You could, in theory, get a triple crank like a Sugino xd and run a 46 (110mm bcd)on the middle position and a 30 (74mm bcd) on the inner, with nothing on the outer ring's position. (Or a bashring...) But that could be expensive....

Here's an expensive 12-30 9speed:
http://store.interlocracing.com/9elroca.html
12-13-14-16-18-20-24-28-30 close steps; not worth $90, imo

Harris sells one with 12-13-15-17-19-21-24-27-30 -- for $120!!

Tell you what, though... I'd get a 11-30 hg50 for $35: 11,12,14,16,18,20,23,26,30 is about as close as you'll get, even if you'll seldom use the 11t....
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Old 10-18-13, 05:10 PM
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Originally Posted by daihard View Post
Okay, thanks. Mind elaborating on why I can't run a 30T gear on my crankset?
With teeth spaced 1/2" apart around the chain ring perimeter as needed to mate with bicycle chain fewer than 33 wouldn't leave room for the mounting bolts arranged around a 110mm circle.

30T rings are possible on road triples and super compacts because they have the small ring bolts arranged in a 74mm circle that allows rings down to 24T.

FWIW, 53-39-26 x 13-14-15-16-17-18-19-21-23-26 provides the same range as 50-34 x 12-34 although the jumps among the 15-16-17-18-19-21 cogs on the triple granny ring are smaller than the equivalent with 34 x 19-21-24-27 on a 50-34 x 12-30 compact setup .

As long as you're buying new shifters to go from 9 to 10 cogs and considering a new super-compact crankset for even lower gears I'd opt for the double to triple conversion instead provided that the extra width (can you ride a mountain bike without issues? That's even wider than a road triple) doesn't interact with your anatomy. Triple front derailleurs are very inexpensive as long as you don't want bells and whistles like titanium bolts and aluminum cages.

Last edited by Drew Eckhardt; 10-18-13 at 05:16 PM.
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Old 10-18-13, 09:30 PM
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Originally Posted by Cross Creek View Post
I hesitate to point out the obvious, since I may have missed something, but the jumps from 21-24-27 are the same as the ones from 20-23-26.
No, you didn't miss anything. I just didn't explain myself well. My thinking was that instead of having to make do with the 3 gears (20-23-26), I may be able to shift smoother by utilizing 4 gears (19-21-24-27). The next smaller cog in my current cassette is 17, which I can't make good use of now (due to my lack of strength). Am I making sense?
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Old 10-18-13, 10:27 PM
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Originally Posted by mconlonx View Post
*bzzt* ...kind of.

You can, and actually need, to use a 9sp der with a shimano 10sp road shifter (SL-4600, SL-R770), which is one less item to buy in this setup. Or, yes, OP will also need a 10sp rear derailleur if OP goes with a Shimano mtn 10sp shifter.

And a 10sp chain.
Read the OP again--it's a 7.5FX, with flat bars and MTB shifters. He needs a 10spd derailleur if he goes with 10speed cassette...
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Old 10-18-13, 10:40 PM
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Originally Posted by surreal View Post
Tell you what, though... I'd get a 11-30 hg50 for $35: 11,12,14,16,18,20,23,26,30 is about as close as you'll get, even if you'll seldom use the 11t....
That may be the most desirable option for me at this point. Getting a new derailleur and shifters would be too costly. Of course, the HG50 (Tiagra, I assume?) would have 18-20-23-26 as oppose to the 17-20-23-26 that I currently have, so it may not be too much more useful right now, but as I gain strength, the closer small cogs would probably come in handy.

Thanks for the suggestions!
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Old 10-19-13, 12:13 PM
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Now, one last question. Assuming that I simply replace my current SRAM 9-speed cassette with another 9-speed one - probably a Shimano Tiagra HG50, will I need to replace anything else? From what you guys have told me, I will be able to use my existing rear derailleur (Shimano Deore) and shifters (Shimano R440). How about the chain? Now that my biggest cog will be smaller (30T vs 34T), will I need to get a shorter chain?
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Old 10-19-13, 01:31 PM
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You could shorten the chain by a link set, but it's not necessary. (if you were to decide to go back, you'd really wish you hadn't)
Your chain currently works fine with all the other smaller cogs, so there's nothing to effect shifting etc.
Think of it as having an extra 2% of links to share the wear.

IF you were going the opposite direction, you'd need to lengthen, assuming the chain was properly sized to start.
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Old 10-19-13, 06:07 PM
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I agree w/ Bill K. Assuming your chain is currently the proper length, that 4t difference shan't be critical. I wouldn't mess with it until I was sure I was keeping that smaller cassette.... and, by then, I'd probably have forgotten about the chain length issue.
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Old 10-19-13, 06:14 PM
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Originally Posted by Bill Kapaun View Post
You could shorten the chain by a link set, but it's not necessary. (if you were to decide to go back, you'd really wish you hadn't)
Your chain currently works fine with all the other smaller cogs, so there's nothing to effect shifting etc.
Think of it as having an extra 2% of links to share the wear.

IF you were going the opposite direction, you'd need to lengthen, assuming the chain was properly sized to start.
Originally Posted by surreal View Post
I agree w/ Bill K. Assuming your chain is currently the proper length, that 4t difference shan't be critical. I wouldn't mess with it until I was sure I was keeping that smaller cassette.... and, by then, I'd probably have forgotten about the chain length issue.
Thanks, guys!
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Old 10-20-13, 08:00 AM
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Originally Posted by Erwin8r View Post
Read the OP again--it's a 7.5FX, with flat bars and MTB shifters. He needs a 10spd derailleur if he goes with 10speed cassette...
Read the OP again again, where he doesn't mention any kind of shifters, and then head over to the Trek website where thearchive listing for the fx 7.5 says it came with Shimano R440 shifters, flat bar road shifters that work for road gearing/drivetrain.

Sounds like OP got this worked out, but if someone reading this is still considering a switch to 10sp, you could do it one of two ways:

- Get a right/rear 10sp flat bar road shifter (Shimano SL-4600, SL-R770), keep the Deore 9sp rear derailleur, replace w/ 10 sp cassette and chain.
-or-
- Get a full 10sp mtn system: shifter, derailleur, cass, and chain.

First option may be slightly cheaper at comparable parts quality levels because there's one less component to buy, the RD.
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