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Cassettes - Need advice please

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Cassettes - Need advice please

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Old 12-25-17, 05:40 PM
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Morriep
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Cassettes - Need advice please

What size cassettes do you use for touring? My Trek 520 is equipped with the standard 11-32 9 Speed. I am considering going 11-42 10 Speed. The front is 48/36/26. Any comments please?
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Old 12-25-17, 05:59 PM
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mrveloman
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I am sure you'll get lots of different responses. I tour on a 1999 Cannondale T500 which I have changed to a 11-34 rear and a 50-39-24 front. What you need will depend on your own physical condition. For me I am 65 and overweight at 215 lbs so a nice low gear is required.
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Old 12-25-17, 07:27 PM
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Morriep
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Thanks for the input
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Old 12-25-17, 08:29 PM
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Originally Posted by Morriep View Post
What size cassettes do you use for touring? My Trek 520 is equipped with the standard 11-32 9 Speed. I am considering going 11-42 10 Speed. The front is 48/36/26. Any comments please?
what derailleur do you have?
Will it work with an 11-42?
Do you know how to fix it so that it dies work?
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Old 12-25-17, 09:15 PM
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I like an 11-34, any larger of a spread and I find myself constantly looking for that in-between right gear that's not there. If that 26 x 34 isn't low enough for you, you can easily and inexpensively replace that 26 cog in the front with a 24.
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Old 12-25-17, 10:00 PM
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Originally Posted by Morriep View Post
What size cassettes do you use for touring? My Trek 520 is equipped with the standard 11-32 9 Speed. I am considering going 11-42 10 Speed. The front is 48/36/26. Any comments please?
10 tooth change?...thats a HUGE difference! As mentioned, can your drivetrain even handle it?

With 32mm tires-
- your current granny is 21.88 gear inches.
- your proposed granny is 16.74 gear inches.

If you just got a 24t inner chain ring, you would have 20.26 gear inches. Thats $20 and a 10min change.
If you got a 24t ring and a 34t cassette, you would have 19.18 gear inches. Thats $40 and a 20min change.

Just mention these options since they almost certainly wpuld work woth your current drivetrain and a 19.18GI is really low. You sure it wouldnt be low enough for you?
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Old 12-25-17, 11:22 PM
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Your current low gear of 22" is already quite low. We don't know your fitness level, what grades you plan on climbing, or how much gear weight you're carrying. How have you determined that you need such a reduction in your lowest gear?
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Old 12-25-17, 11:28 PM
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you want to convert to 10-speed?
does that mean new deraillers and shifters and cassette and chain?

more cost effective to stick with 9-speed.
first off, how much gear do you carry, and
in what terrain? do you need super-low gears?
do you ever use the high end?

check your RD? what's the max cassette cog,
and the max capacity?

you might consider buying a new crank.....
assuming yours won't take wee, tiny rings
and the big ring isn't used often.

get a deore 22-30-40 or 22-32-44

*****

my latest 700c touring build has:

11-36 9-spd cassette (sunrace)
22-30-40 FC-M523 (deore) 10-spd hollowtech crank
RD-M591 deore 9-spd RD, plays well with the 36T cassette
FD-M610 deore FD.

that's a low of 17.5 and a high of 104
(26" wheels would give a sweeet 15.9!)

Last edited by saddlesores; 12-25-17 at 11:48 PM. Reason: those dang voices in muh haid!
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Old 12-25-17, 11:36 PM
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i have 8 speed so ymmv but i find 12-34 with a 24 tooth granny to be plenty low. as mentioned before this gives about 19 inches for my granny.
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Old 12-26-17, 03:56 AM
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22-32-42 or 44 cranks. Just go as low as possible without going to rare parts.

Cassette depends on terrain but from my experience, get at least 32t. 28 is fine also for lighter load but with 32 you have more safety net.
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Old 12-26-17, 04:55 AM
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My Surly Long Haul Trucker has a Shimano Deore XT CS-M770 9-speed 11-34 with a triple up front.
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Old 12-26-17, 08:36 AM
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Originally Posted by Morriep View Post
What size cassettes do you use for touring? My Trek 520 is equipped with the standard 11-32 9 Speed. I am considering going 11-42 10 Speed. The front is 48/36/26. Any comments please?
I am not sure how much you know about bicycle gearing, but 11-42 and 48/36/26 is a 53 tooth difference, the largest capacity derailleur to date is the Shimano T8000, and that only has a capacity of 47 teeth, but it is only designed for a max sprocket size of 36t. Long story short its not possible, since the rear derailleurs that can take a 42t large sprocket, only have a capacity of about 39t.

42t cassettes are only designed for 1x systems, but a 40t cassette can be used for 2x systems.

My advise is throw on an 11-34 cassette, and leave it at that, because what you want is not possible.

If you really want to lower you granny gear, swap your 26t chainring for a 22t, you have a friction front sifter so it will work fine, just throw on a cheap chain keeper (dog tooth thingy) to stop the chain dropping off from the large chaingring drop, and don't do any extreme cross chaining.
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Old 12-26-17, 10:51 AM
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I toured blissfully with a 6 speed freewheel 13 to 34t, and a 50, 40, 24 triple crank & 700c ... 622-35 tires on the wheels..


sometimes , when it was steep, I got off and pushed..
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Old 12-26-17, 04:05 PM
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Originally Posted by fietsbob View Post
I toured blissfully with a 6 speed freewheel 13 to 34t, and a 50, 40, 24 triple crank & 700c ... 622-35 tires on the wheels..


sometimes , when it was steep, I got off and pushed..
sounds pretty good to me!
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Old 12-26-17, 07:16 PM
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LeeG
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12-28 9 spd IRD
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Old 12-27-17, 08:19 PM
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Originally Posted by Morriep View Post
What size cassettes do you use for touring? My Trek 520 is equipped with the standard 11-32 9 Speed. I am considering going 11-42 10 Speed. The front is 48/36/26. Any comments please?
Why would you need that gearing? For rock climbing?
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Old 12-27-17, 08:54 PM
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My set up is as follows 3x9:
24/36/48t Crank
11-13-15-17-20-23-26-30-34 Cassette

I don't really use my 24t chainring that often but I like knowing it is there. It is useful for some hills especially loaded.

If I were going to something like 11-42 I would likely go to a double and probably do a compact road crank (50-34) or something similar in 11 speed. However I probably wouldn't go with a set up like that for fully loaded touring.
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Old 12-30-17, 01:25 PM
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Originally Posted by Morriep View Post
What size cassettes do you use for touring?
For off-tar riding running four bags with a fat slick tire 22x32(4) is about the max usable gearing. If the slope requires more or a knobbie I'm better off walking.

Where dinner plate rear granny gears work is high altitude asphalt riding or hardknot pass wales.

What do I use?

My four bag on/off road bike, 44x12 through 22x34.

The on road two bag commuter/touring, 48x13 though 24x28.
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Old 12-30-17, 05:08 PM
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You are trying to drop your lowest gear pretty low, but that will be a lot of parts. It would not cost much to swap out the front 26 for a 24. That would not drop your gearing as low as you want to go, but it would cost very little to make that change because all you need to do is put on a smaller chain ring.
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Old 12-30-17, 06:53 PM
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I got a lot of the "why do you need a gear that low?" responses when I went with a 44/32/20 chainring combo with a 9 speed 12-36 cassette in back. Fifteen gear inches Yo



Worked just fine

...and this on an '89 Voyageur with downtube friction shifters using the original (5 speed?) derailleurs.

IME there is typically such a wide range of gearing on any triple chainring set-up that you can afford to have a couple of uber low gears at the low end, even if you almost never use 'em. With gear and water it ain't unusual for my loaded bike to weigh 70lbs even before I get on, there are steep grades out there, and spinning up one at 4mph as opposed to 5mph can make a big difference to my legs and knees.

IMHO,

Mike
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Old 12-30-17, 11:28 PM
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Originally Posted by saddlesores View Post
you want to convert to 10-speed?
does that mean new deraillers and shifters and cassette and chain?

more cost effective to stick with 9-speed.

you might consider buying a new crank.....
assuming yours won't take wee, tiny rings
and the big ring isn't used often.

get a deore 22-30-40 or 22-32-44

*****

my latest 700c touring build has:

11-36 9-spd cassette (sunrace)
22-30-40 FC-M523 (deore) 10-spd hollowtech crank
RD-M591 deore 9-spd RD, plays well with the 36T cassette
FD-M610 deore FD.

that's a low of 17.5 and a high of 104
(26" wheels would give a sweeet 15.9!)
I agree esp in re the complications & expense of going 10-speed. Also, don't super-size cassettes weigh more?
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Old 12-31-17, 05:55 AM
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I agree with several earlier posters. Lower your crankset up front.
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Old 12-31-17, 08:02 AM
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saddlesores
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Originally Posted by Sharpshin View Post
..."why do you need a gear that low?" ..... Yo
Yo indeed!
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Old 12-31-17, 09:01 AM
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Originally Posted by Sharpshin View Post
I got a lot of the "why do you need a gear that low?" responses when I went with a 44/32/20 chainring combo with a 9 speed 12-36 cassette in back. Fifteen gear inches Yo
...
Impressive, I thought that my low gear of 16.5 gear inches on my Rohloff expedition bike was pretty low but yours is still lower.
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Old 01-08-18, 12:36 PM
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After doing a lot of ring and cog switching on my previous bike, I came to the conclusion that I spend most of my time in the middle gears so there is where I wanted everything to work the best. What I am saying is that expanding your gear range will cause the middle of the range to suffer. 90% of my riding is between 8-12 MPH.

My suggestion is to go with a 34T cassette first. Try it fully loaded, then if you feel that it needs lower, go with a 24T ring. Your wallet will thank you for not changing to 10-speed.
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