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crazy granny gear spotted #5163620 07/17/19 04:32 PM
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Number_35 Offline OP
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https://www.bikes.com/en/bikes/instinct/2019?tid=72

Saw a Rocky Mountain MTB, the same as, or similar to, the linked one, in my LBS a few days ago. The granny gear on the rear cassette was huge, with 50 teeth. The bike had a 1 x 11 drivetrain, with a 33-T front chainring and an 11-speed rear cassette (11T to 50T).

I realized that the resultant lowest gear ratio is not that crazy - 50/32 = 1.5625. That's similar to my ancient (2002) Rocky Mountain Fusion (with a triple front chainring - 22/32/42) - 32/22 = 1.4545 ... and with a 34T rear cassette, which I've used on occasion, that lowest gear would drop to 34/22 = 1.5454, just about identical to the 11-speed.

The only compromise would be the highest gear ratio - 11/42 (my old bike) = 0.262, vs. 11/32 = 0.34375.

However, the new bike is a 29er (vs. my old 26er), so my bike would have a slightly-lower low gear at the drive wheel.

2002 RM MTB
Distance traveled in lowest gear per crank revolution = 22/32 x 26" x Pi = 56"
Distance traveled in highest gear per crank revolution = 42/11 x 26" x Pi = 312"

2019 RM MTB
Distance traveled in lowest gear per crank revolution = 32/50 x 29" x Pi = 58"
Distance traveled in highest gear per crank revolution = 32/11 x 29" x Pi = 265"

Overall though, not much compromise for the weight savings and reduced complexity of having no front derailleur. (Anyone care to check my math?)

Re: crazy granny gear spotted [Re: Number_35] #5163684 07/17/19 06:01 PM
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"granny gear"
???


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Re: crazy granny gear spotted [Re: Number_35] #5163692 07/17/19 06:09 PM
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I've got a hybrid 15 speed bike, which is a cross between a road bike and a mountain bike, it's got crazy low gears and decent road gears. The lowest of the low is so slow that you're almost sitting still while spinning your legs as fast as you can. I can't even ride it in that gear.


'03 Suburban
Re: crazy granny gear spotted [Re: Lolvoguy] #5163718 07/17/19 06:40 PM
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Number_35 Offline OP
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Originally Posted by Lolvoguy
"granny gear"
???
This may be local cycling slang. In any case, it means a gear so low that a grandmother could pedal with ease.

Re: crazy granny gear spotted [Re: Number_35] #5163719 07/17/19 06:42 PM
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Miller88 Offline
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It's nice for climbing crazy hills, that's for sure! When I used to mountain bike a lot, I had a modified casette that had a realllllllllllly low 1st gear. Was quite nice for some of the stuff I used to do back then.


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Re: crazy granny gear spotted [Re: A_Spruce] #5163759 07/17/19 07:39 PM
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Number_35 Offline OP
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Originally Posted by A_Spruce
I've got a hybrid 15 speed bike, which is a cross between a road bike and a mountain bike, it's got crazy low gears and decent road gears. The lowest of the low is so slow that you're almost sitting still while spinning your legs as fast as you can. I can't even ride it in that gear.
I've got a hybrid also - a 2010 Kona Dew Deluxe, 3 x 8. Low gear is low, and I was delighted to have it when we cycled from Banff to Jasper a few years ago. There is one sustained climb so steep that I was spinning in the lowest gear and plodding up the hill at 5 kph - sub-walking pace. Those low gears have their place!

Re: crazy granny gear spotted [Re: Number_35] #5163794 07/17/19 08:09 PM
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tcp71 Offline
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my 1x11 is running a 32 tooth front with a 46 tooth rear as my granny gear. I could use more I'm so out of shape. Maybe a 30 x 50 would help my climbing...


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Re: crazy granny gear spotted [Re: Number_35] #5163799 07/17/19 08:17 PM
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dailydriver Offline
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I was behind a car with a Santa Cruz with that 1x11 gearing setup on the rear mounted rack, with a TINY single front ring.

At first, I thought it was a multiple speed TRIALS bike, until I remembered that those drive train setups are becoming much more common on general use mountain bikes nowadays. wink


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Re: crazy granny gear spotted [Re: Number_35] #5163833 07/17/19 08:48 PM
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SRAM Eagle,, (GX and above) 1X12 with a 9-50 spread. Usually paired with a 32t chainring for 27.5 or a 30t chainring for the two-niner crowd.

Last edited by Taildragger; 07/17/19 08:49 PM.

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Re: crazy granny gear spotted [Re: Number_35] #5163963 07/18/19 01:13 AM
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Originally Posted by Number_35
I've got a hybrid also - a 2010 Kona Dew Deluxe,


Mine is a Trek of about the same era. I test rode half a dozen bikes before deciding on the Trek, it was the only one that wasn't a chore to ride. Most bikes are stiff to pedal, no matter what gear you're in, with the Trek, changing gears just makes you go faster with minimal added pedal effort, which, IMHO, is the mark of a good bike.


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Re: crazy granny gear spotted [Re: Number_35] #5164035 07/18/19 06:56 AM
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Correction, SRAM Eagle GX cassette is 10-50.
[Linked Image]


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Re: crazy granny gear spotted [Re: Number_35] #5164036 07/18/19 06:59 AM
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It's crazy what they are putting into cassettes these days. I'm old school and run a relatively narrow cassette. But then again both my road bikes are triples so the granny is there "just in case". I pretty much only use it on dirt roads.

Some of us road bikers were getting ready to leave for a ride when we spotted my boss and his mountain bike. I kidded him about having a pie plate for a granny low. Another guy asked him how it worked--does it go backwards when you pedal?


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Re: crazy granny gear spotted [Re: Number_35] #5164038 07/18/19 07:01 AM
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Originally Posted by Number_35
Originally Posted by Lolvoguy
"granny gear"
???
This may be local cycling slang. In any case, it means a gear so low that a grandmother could pedal with ease.

It's a pretty old term. Pickup trucks used to have a granny low (think L-1-2-3 on the SM420 and SM465's and like). Although recently I came across someone calling it a bulldog low, or bulldog gear, hadn't seen that one before.


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Re: crazy granny gear spotted [Re: Number_35] #5164050 07/18/19 07:15 AM
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I used to pile my daughter into a Burley trailer and take her up in the hills around our neighborhood...my trail bike had some decent granny gears for the climbs, but there were some spots that were so steep that I had a really hard time keeping the front wheel down even when I would get off my saddle and keep as much weight as possible over the handlebars.
It finally hit me that it would be a really bad scene if I flipped over on top of my daughter and I stopped going to those hills.
That Burley was great, we bought the kit that made it convertible between bike trailer and jogging stroller with more or less a twist and my wife and I both used it all the time.


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Re: crazy granny gear spotted [Re: Number_35] #5167721 07/21/19 11:28 PM
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I bought a Cannondale Jekyll 4 27.5 a couple months ago. It's 1x11 with a 30 up front and 11-46 on the cassette.

This bike is a ton of fun, but with my skills I'll never use it to its potential. I found a nice closeout deal on this one that was leftover from last year.

https://www.cannondale.com/en/USA/Bike/ProductDetail?Id=1227b82a-d1bb-4f8b-8350-a0defe3ceb23


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