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Compare Ratios of Gearing

#126 2019-02-21 7:06am

El Gecko
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Re: Compare Ratios of Gearing

repurpuss wrote:

Hobbes12 wrote:

repurpuss wrote:

So should i stick with a standard 39T chainring and run an 18T ? Most chainrings i want for my build are 43 or 44.

39/16 is the most common for 24’s...

43/18 might be about the same...

Ok thanks for the help.

That's a typo.  39/17 is the most common for cruisers.


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#127 2019-02-21 8:21am

Hobbes12
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Re: Compare Ratios of Gearing

El Gecko wrote:

repurpuss wrote:

Hobbes12 wrote:


39/16 is the most common for 24’s...

43/18 might be about the same...

Ok thanks for the help.

That's a typo.  39/17 is the most common for cruisers.

16t & 9t are the most common...


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#128 2019-02-21 8:28am

El Gecko
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Re: Compare Ratios of Gearing

Hobbes12 wrote:

El Gecko wrote:

repurpuss wrote:

Ok thanks for the help.

That's a typo.  39/17 is the most common for cruisers.

16t & 9t are the most common...

Maybe on a 20" wheel.  For 24" wheels, standard is 39/17 which equals roughly 55 gear inches, same as 44/16 on a 20" wheel.  39/16 would be harder, but not impossible--like running a 47/16 on a 20".

Here's a quick comparison of the various gearing we've been discussing.

repurpuss has a 43T sprocket in the front with a 24 inch wheel, shown the last column

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/103998/gear_chart_0221195c6eefc7a2.jpg

Last edited by El Gecko (2019-02-21 10:37am)


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#129 2019-02-27 10:45am

repurpuss
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Re: Compare Ratios of Gearing

El Gecko wrote:

Hobbes12 wrote:

El Gecko wrote:


That's a typo.  39/17 is the most common for cruisers.

16t & 9t are the most common...

Maybe on a 20" wheel.  For 24" wheels, standard is 39/17 which equals roughly 55 gear inches, same as 44/16 on a 20" wheel.  39/16 would be harder, but not impossible--like running a 47/16 on a 20".

Here's a quick comparison of the various gearing we've been discussing.

repurpuss has a 43T sprocket in the front with a 24 inch wheel, shown the last column

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-image … efc7a2.jpg

Ahh yes. Perfect because i actually scored a 92 Mach One parts bike and it has the exact 43T sprocket and spider I want. Thanks


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#130 2019-09-09 2:16pm

Cramcan
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Re: Compare Ratios of Gearing

Wondering what the scientifical numbers would be with a 47 / 17 gearing runnin a 1.5 tire on a 20x1.5 rim compared to a 47/18 with a 2.125 tire on a 1.5 rim.


Looking for : Bomber #'s , NOS/good condition white (red ,white and blue decals) 50's Seiss bike light , Huffy Bandit tire , Camel Supercross stuff , spoke length for 3x lace pattern with mid 90's Kovachi hubs (flip-flop rear) and 20" ,1.5 Odyssey T-1000 rims.

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#131 2019-09-09 4:01pm

El Gecko
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Re: Compare Ratios of Gearing

Cramcan wrote:

Wondering what the scientifical numbers would be with a 47 / 17 gearing runnin a 1.5 tire on a 20x1.5 rim compared to a 47/18 with a 2.125 tire on a 1.5 rim.

The 47:17 on a 1.5 tire would give you an extra 1.5" or so of distance on each complete turn of the pedals. They are very close, and it really depends on the inflated diameters of both tires since they can vary so much. A knobby 2.125 and a smooth 1.5 would be nearly equal when you add a tooth to the freewheel for the bigger tire.

Last edited by El Gecko (2019-09-09 4:02pm)


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#132 2019-09-09 11:55pm

Cramcan
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Re: Compare Ratios of Gearing

Awesome! Thanks so much for the quick reply with the helpful info!


Looking for : Bomber #'s , NOS/good condition white (red ,white and blue decals) 50's Seiss bike light , Huffy Bandit tire , Camel Supercross stuff , spoke length for 3x lace pattern with mid 90's Kovachi hubs (flip-flop rear) and 20" ,1.5 Odyssey T-1000 rims.

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#133 2020-06-05 5:11pm

audraandreacaybree
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Re: Compare Ratios of Gearing

30/10
175mm

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#134 2020-12-27 5:29pm

Jermsss512
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Re: Compare Ratios of Gearing

How about best ratio for a 29? Still 39, 17??

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#135 2021-01-03 2:04am

DadeRich
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Re: Compare Ratios of Gearing

20" 43/16 165mm crank i hit about 25mph on tha street no downhills or slopes in miami we got flatland n smooth roads. I have knoby tires too maybe if i slap sum street racing tires it would make me extra fast.

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#136 2021-01-03 2:15am

DadeRich
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Re: Compare Ratios of Gearing

Tha more teeth tha sprocket n tha less teeth on tha freewheel times 20" always gave me high ratios but i havent put it to tha test plus you goin to need a flipflop hub to slap a smaller freewheel n also a 3/32 narrow chain drive is lighter n quicker most sprockets dont accept 3/32 though.

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#137 2021-01-05 8:56am

El Gecko
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Re: Compare Ratios of Gearing

Jermsss512 wrote:

How about best ratio for a 29? Still 39, 17??

Depends on terrain, tires, bike weight, your weight, your leg strength, etc. Offroad? Gear down like 32/18. Onroad can be anything you want. If it's hilly where you live, stick with lower gears. If it's flat, you can really kick the ratios up for speed. For example, my city bike has 42/16 gearing on 38C road bike tires (small tires but same rim diameter as 29ers), but it's tough to start off from a stop, and the frame flexes when I crank hard. The 39/17 would be a pretty good all around ratio, just not as easy to ride off road.


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#138 2021-01-11 3:56pm

Jermsss512
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Re: Compare Ratios of Gearing

idiotcountry2 wrote:

Credit, where credit is due, cmc posted one of these charts in another thread and I expanded upon it. EASY cross-reference charts to evaluate sprocket ratios.

http://i1299.photobucket.com/albums/ag6 … c723a2.png

http://i1299.photobucket.com/albums/ag6 … 13ec66.png

http://i1299.photobucket.com/albums/ag6 … 30adaa.png

Awesome! Can you make one for 29 cruisers?

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#139 2021-01-17 6:18pm

cmc
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Re: Compare Ratios of Gearing

My idea for this came from Profile racing. My charts just add the color coded range of what is easy/medium/hard.

https://www.profileracing.com/gear-inch-chart/

22
https://ep1.pinkbike.org/p3pb16025645/p3pb16025645.jpg

24”
https://ep1.pinkbike.org/p3pb14687058/p3pb14687058.jpg

26”
https://ep1.pinkbike.org/p3pb15219941/p3pb15219941.jpg

27.5
https://ep1.pinkbike.org/p3pb18497541/p3pb18497541.jpg

29
https://ep1.pinkbike.org/p3pb18497542/p3pb18497542.jpg

Last edited by cmc (2021-01-17 6:20pm)


20", 22", 24", 26", and 700c !

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#140 2021-01-17 6:27pm

Jermsss512
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