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48 36 26 Chainring 10spd - Is This Possible?

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48 36 26 Chainring 10spd - Is This Possible?

Old 06-05-17, 11:53 PM
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EduF
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48 36 22 Chainring 10spd - Is This Possible?

Hi. Just recently bought a Marin Muirwoods 29 for all around duty and I'm loving the bike.

I just did a 100km tour on our local area and it's the first time I encountered this long hill about 18-25% grade and it killed me! I'm not used to stopping and resting before reaching the top of a climb but this made me put my foot down and and rest a bit.

See Casile climb image.


Now it got me thinking of my gears. My crank is a 9spd XCR6 with 48 36 26 chainings paired with a 12-36 cassette. My lowest gear is 20in but looks like I need them lower to avoid stopping on climbs.

XCR6 48 36 26


My previous Trek bike was a 10spd 42 32 24 with a 11 - 36 and lowest gear was 17.7in (26er) and realized I was missing this low gear in the Muirwoods.

Now, I have most of the drivetrain from my Trek:
SLX FC M670 42 32 24
SLX FD M670
SLX RD M675
SLX CS HG81-10 11-36
SLX SL M670

I was thinking of selling them or moving them all to the Muirwoods and upgrade to 10spd. But the lowest gear would still be 19.5in - which is basically the same as the current stock setup which had 20in.

So I guess that wouldn't really help...

I searched online and found this thread:
http://www.bikeforums.net/bicycle-me...t-touring.html

Barrettcsv managed to setup a 48 36 22 Deore crank but this is a 9spd setup and he's using road FD. I really liked the idea as I also liked the 48 large and 36 mid rings for cruising. 22 crank with 36 cogs will give me 16.9 gear inches. Perfect!

I'm thinking of getting 48t and 22t chain rings to replace the 42/24 from the SLX crank.

I've already managed to get LX FD T670 with 22t capacity, but with the setup above, I should be looking at 26t capacity. So my question is will the FD T670 work with a 48 36 22 crank on a 10spd setup.

Another option I was looking at was a 44 32 22 crank. I already saw an Alivio FC T4060 with 44 32 22 which only costs PhP2000 (US$40). This will give my lowest gear at 16.9in but will loose out on the top gear only having 101.3in.

My first option was the 48 36 22 10spd but if its not possible, then might just try the 44 32 22 9spd.

Am I crazy to think it can work?
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Last edited by EduF; 06-06-17 at 12:34 AM. Reason: wrong title
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Old 06-06-17, 04:41 AM
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EduF, I'd first look at swapping the inner chain ring to a smaller one. If the BCD and the number of bolt holes are the same as the SLX's 24T chain ring would be my choice.

Brad
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Old 06-06-17, 04:56 AM
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Hi EduF,

I would just change the crank to the Alivio 44, 32 & 22. I'd keep the cassette and everything else 9-speed. Try that combination before changing the shifters to 10 speed.

A 44 chainring combined with a 11 tooth cog and a 29er tire can produce more than 30mph at a 100 rpm cadence. Unless you are racing, you're unlikely to need to produce more speed using crank driven power. I use a 12-27 9 speed cassette with the 48, 36 and 22 chainrings. I only use the 48t chainring when going downhill and I let gravity do all the work above 30mph.

Any hill steeper than 18% is difficult for almost all recreational cyclist. Ultimately, you will need to train the body to produce enough power to overcome the hill. Gearing alone won't overcome extreme climbs.

Use this online tool to review: http://home.earthlink.net/~mike.sherman/shift.html

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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

Last edited by Barrettscv; 06-06-17 at 05:30 AM.
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Old 06-06-17, 06:22 AM
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Originally Posted by bradtx View Post
EduF, I'd first look at swapping the inner chain ring to a smaller one. If the BCD and the number of bolt holes are the same as the SLX's 24T chain ring would be my choice.

Brad
Good idea, might be worth a try. 24/36 will give me 18.4 gear inches.

Originally Posted by Barrettscv View Post
Hi EduF,

I would just change the crank to the Alivio 44, 32 & 22. I'd keep the cassette and everything else 9-speed. Try that combination before changing the shifters to 10 speed.

A 44 chainring combined with a 11 tooth cog and a 29er tire can produce more than 30mph at a 100 rpm cadence. Unless you are racing, you're unlikely to need to produce more speed using crank driven power. I use a 12-27 9 speed cassette with the 48, 36 and 22 chainrings. I only use the 48t chainring when going downhill and I let gravity do all the work above 30mph.

Any hill steeper than 18% is difficult for almost all recreational cyclist. Ultimately, you will need to train the body to produce enough power to overcome the hill. Gearing alone won't overcome extreme climbs.

Use this online tool to review: http://home.earthlink.net/~mike.sherman/shift.html

Barrettscv
Thanks Barrettscv! Just the guy I wanted to reply.

I was also thinking of that: 44 32 22 with a 11-34 will give me 17.9 gear inches for the lowest and 110.6 for the highest. But that will need another cassette as I have 12-36 right now.

The thing is the stock FD in the Marin is Altus FD M370 is kinda soft. When I ride in the rain, using 48t crank and 18t cogs (3-6 in shifters) the chain rubs to the FD. But when it's dry, all is good. Not sure if the problem here is the FD or the square tapered crank/BB

So I was looking to upgrade to a better FD and/or a hollewtech crank/BB.

Then I'll come to the issue of looking for a reliable 9spd FD for a trekking crank which is hard to find. Or will a mtb FD work? Last I checked 44t-48t needs trekking FD as mtb FD only allows 42t max with 18t capacity.

I was initially set to get 48 36 26 10spd crank (that's why I already bought the LX FD) but realized my need for a lower gear when I did that climb. Most areas I'd like to tour have this kind of uphill grades. Pretty mountainous in my area.

And just being finicky on things, I am used to the dual pull of the SLX trigger shifter where I can use my thumb for up and down shifting. Now the Muirwoods has Acera SL M3000 (which is quite impressive actually) that only works thumb for down shift and pointer finger for up shift.

So if I stick on the 9spd setup, I'd upgrade the crank, FD and shifters ~ estimated cost around Php5500 (US$110).

As I already have the 10spd parts which are used but in good working condition, the only thing needed actually was the right crank and I was looking at this initially:
Shimano Deore FC-T551 10 Speed Mountain Bike Bicycle Crankset 48-36-26 175mm | eBay ~ estimated cost PhP4500 (US$90)

And then swap the 26t to a 22t ~ estimated cost PhP800 (US$16).

Or just change SLX chainrings 42 to 44 and 24 to 22. Do I need to find Shimano's for this to work or any other brand is fine as long as it is specified 10 spd?

Hmmm... But then I'd need 11-36 10spd cassette for a lower gearing.

I might be overthinking this....


Thanks for that online tool, I'll have a play around it.

Last edited by EduF; 06-06-17 at 06:36 AM.
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Old 06-06-17, 07:34 AM
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Originally Posted by EduF View Post
Good idea, might be worth a try. 24/36 will give me 18.4 gear inches.



Thanks Barrettscv! Just the guy I wanted to reply...

...As I already have the 10spd parts which are used but in good working condition, the only thing needed actually was the right crank and I was looking at this initially:
Shimano Deore FC-T551 10 Speed Mountain Bike Bicycle Crankset 48-36-26 175mm | eBay ~ estimated cost PhP4500 (US$90)

And then swap the 26t to a 22t ~ estimated cost PhP800 (US$16).

Or just change SLX chainrings 42 to 44 and 24 to 22. Do I need to find Shimano's for this to work or any other brand is fine as long as it is specified 10 spd?

Hmmm... But then I'd need 11-36 10spd cassette for a lower gearing.

I might be overthinking this....


Thanks for that online tool, I'll have a play around it.
The Deore FC-T551 is a worthwhile upgrade over your current crank and replacing the small chainring will give you a big range. This crank will be very stiff and should eliminate your chain rub problem.

I would combine this crank with your 9 speed drivetrain. Just use a 10 speed chain like the Shimano CN 6600, this is a good chain for triples. A 10 speed chain will work well with a 9 speed cassette and a 10 speed crankset. Be sure to size the chain to the big 48 chainring and big 36 cog. The chain might be a little long when on the small 22 chainring and the smaller cogs, but avoid using these combinations.

Don't over-think it. You don't need to upgrade everything, just a few key parts.

Have fun,

Barrettscv
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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

Last edited by Barrettscv; 06-06-17 at 07:41 AM.
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Old 06-06-17, 07:39 AM
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48,36,22, Is possible, I have such, a 110-58 crank spider on mine, current stuff ? IDK.
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Old 06-06-17, 07:46 AM
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Originally Posted by Barrettscv View Post
The Deore FC-T551 is a worthwhile upgrade over your current crank and replacing the small chainring will give you a big range. This crank will be very stiff and should eliminate your chain rub problem.

I would combine this crank with your 9 speed drivetrain. Just use a 10 speed chain like the Shimano CN 6600, this is a good chain for triples. A 10 speed chain will work well with a 9 speed cassette and a 10 speed crankset.

Don't over-think it. You don't need to upgrade everything, just a few key parts.

Have fun,

Barrettscv
I forgot to mention that I still have my old 10spd chain - CN HG75. I'm hoping this will work and the length is enough.

The Deore 48 36 26 will be replaced by a 22t, now will my Deore LX FD T670 work fine with that. It says 22t capacity for the FD so I'm a bit worried. Or just use the Altus FD M370?

And will 10spd FD will work with 9spd shifter no issues?

If I can get my hands on some decent 44t and 22t replacement for my SLX 42 34 24, that'll be the cheapest option. I found an local online seller with a Shimano SG-X 44t and 22t brand new actually, but I'm not sure if its 9 or 10spd. Already asked him and waiting for the reply. I can't find any decent description online what that SG-X means.

But it has a Mega 9 logo.
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Old 06-06-17, 07:53 AM
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Originally Posted by fietsbob View Post
48,36,22, Is possible, I have such, a 110-58 crank spider on mine, current stuff ? IDK.
What's a 110-58?

I've read somewhere that old model FD (maybe early 2000s) had a much larger capacity ~ 48t?
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Old 06-06-17, 07:57 AM
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Mechanic's speak, in mm, for 2 different bolt circle diameters... 110 - 74 is more common, 24t minimum, tooth count. 5 bolt ..



the arc of the outer plate of the FD, does come in a variety of shapes,

nowadays shimano calls their 'trekking group', having a triple crank with a 48t outer..





...

Last edited by fietsbob; 06-06-17 at 08:05 AM.
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Old 06-06-17, 08:21 AM
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Originally Posted by fietsbob View Post
Mechanic's speak, in mm, for 2 different bolt circle diameters... 110 - 74 is more common, 24t minimum, tooth count. 5 bolt ..



the arc of the outer plate of the FD, does come in a variety of shapes,

nowadays shimano calls their 'trekking group', having a triple crank with a 48t outer..


...
Thanks for clearing that up. Yes, I guess that's what Shimano calls the 44-48t cranks - trekking. And a matching FD to avoid issues. But with what Shimano says on capacity, 42t for the LX FD T670, then it won't work on the 48 36 22 crank?
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Old 06-06-17, 09:48 AM
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So try it, too much in pre guarantee requirements, here.

Kids !
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Old 01-18-18, 08:47 PM
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I thought I'd give an update.

I ended up getting new chainrings from Driveline including a good looking chainguard. Got 44-32-22 and replaced the stock chainrings from SLX.



Very happy with this and I use the full range of the drivetrain frequently (paired with 11-34 cassette).
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Old 01-19-18, 10:49 AM
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With that 22-34, you should be able to ride straight up a coconut palm, or at least a volcano!

What riding do you do that you need such a huge gear change available?
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Old 01-21-18, 07:50 PM
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Originally Posted by Wanderer View Post
With that 22-34, you should be able to ride straight up a coconut palm, or at least a volcano!

What riding do you do that you need such a huge gear change available?
And I'm thinking maybe get even replace it with 11-36 when it wears out.

The areas I tour are usually the roads less traveled with some serious slopes. Having a very low gear is very welcome.
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Old 01-22-18, 08:07 AM
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Very cool - please share some pictures of your rides. We love stuff from far away places!
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Old 01-23-18, 08:07 AM
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With a 17"-gear a cadence of 100 would put you at 5 mph, so either you are a really good spinner
or have exceptional balance for riding at sub 3.5 mph speeds up steep hills. I wobble a good bit
in that speed range on hills, on the bent with a low ~22-23" gear.
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