Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

2 speed freewheel?

Old 10-20-17, 03:46 AM
  #1  
damianomigani
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2 speed freewheel?

Hi!
I recently upgraded to a nice Genesis Dayone 10 singlespeed black. I had two (****ty) bikes, a vintage road bike and an electric bike that constantly gave me problems. Sold both of them and got this one brand new and so far i love it!
I decided to go for a singlespeed because i like the simplicity of it and because all i do with it is commute to work on flat traffic-free canal-side in London.
My current freewheel has 17 teeth, which is great in traffic and to maintain a comfortable speed of up to 30kph, i don't miss the gears on my previous bikes, but I have to say that sometimes I wish it had just one more gear. When i reach 30kph it's quite hard to maintain that speed and I pedal like a squirrel on a wheel.
I am looking for the easiest way to add one faster gear.
Ideally i would like to replace the current freewheel with a two speed one, let's say 17 and 13 teeth. I wouldn't mind changing gear manually when i need it by pulling the chain from one to the other ring. Let's say i can keep it on the fast gear when i commute as there is no traffic generally, and put it on the slower gear when I need to ride at slower pace around London. I can't do flip flop wheel because i have diskbrake on the other side.
Does this (or similar) solution even exist? Has anyone done anything similar? do you have any advice for me?

Thank you!
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Old 10-20-17, 04:49 AM
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pcf
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Get a rear wheel with a SRAM Automatix hub.
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Old 10-20-17, 06:23 AM
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Originally Posted by pcf View Post
Get a rear wheel with a SRAM Automatix hub.
I am willing to bet that it is pretty damned hard to find a 2-speed auto-shift hub that will fit a disc brake

That being said - several companies, most notably White Ind, make "double cog" freewheels of varying tooth combos, but nothing with 13t, as 16 is generally the smallest freewheel available, but depending what you do with your chainring, and quite often guys wanting 2 rather different gearings will use a double up front too, you should be able to accomplish your goal with one of those.

Cool bike BTW...

Last edited by IAmSam; 10-20-17 at 06:27 AM.
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Old 10-20-17, 06:41 AM
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damianomigani
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Thank you both. it's an interesting idea the automatic hub, however i see it as hard to implement with the disk. plus it requires a whole new rim, solutin that i am trying to avoid.
About the double cog freewheel, i found one that could possibly be compatible: the White Industries Dos ENO Freewheel 16/18t. Do you think that going from a 17t to a 16t will bring noticeable benefits in terms of speed for my needs?
cheers
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Old 10-20-17, 06:47 AM
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it will be a little noticeable, but it's weather you'll actually want to stop and change it over everytime you need to. It can be a bit of a farce. I changed the gearing down on my SS due to a couple of long hills on my commute. Looking at my Strava, theres virtually no difference in speed at all, due to speeding up going uphill and finding it easier to pedal in headwinds.

Also, stick a pic of your bike in here
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Old 10-20-17, 12:05 PM
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16/18, 17/19, and 20/22 are available. Do some math and maybe you can find a combo with a new front chain ring that will get you close.

FREEWHEELS ? White Industries


Last edited by SquidPuppet; 10-20-17 at 12:09 PM.
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Old 10-21-17, 06:57 AM
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There is a eBay seller who has 2 speed freewheels in either 16-20 or 17-21. You will have to go to a bigger front chainring. The bigger question is how are you going to shift while riding?

Last edited by bwilli88; 10-21-17 at 07:01 AM.
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Old 10-21-17, 08:03 AM
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Originally Posted by damianomigani View Post
I wouldn't mind changing gear manually when i need it by pulling the chain from one to the other ring.
Easy to say until you've pulled over to stop, hauled out a wrench, loosened the axle nuts, slid the wheel forward, grabbed the lube-filthed chain, engaged the "next" cog and reversed the process, pulled out some wet wipes to de-filth the hands and proceed. Slow, dirty and if executed one than once or twice likely given up on as impractical.

Single speeds are indeed simple and reliable but there are good reasons that for multiple gears either the internal gear hub or derailleur systems replaced 19th century tech for commuters world wide. Small wonder the internal gear Sturmey Archer AW hub was adopted in 1936 Britain for quick, clean, shift- on-the-fly, simple, reliable, wide-enough gear range for commuting duty.

As always, suit yourself.

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Old 10-21-17, 08:41 AM
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Or set up double front chainrings, front derailleur, and chain tensioner.

The 2-speed Automatix is way simpler. You donít really need a rear brake.
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Old 10-21-17, 11:54 AM
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damianomigani
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The idea is to select a gear and stick with it. I.e. I would leave it on the faster setting for everyday commuting but I also like to have the option to switch to slower when I rarely ride through traffic. I wouldnít want to change constantly on the side of the road.. Another way to make the changes easier would be to get a slightly longer chain and a tensioner so that changing gear could be done on the side of the road without tools.
Anyway if my only smaller ring option is 16t , itís probably not worth the hassle as I currently have 17t and losing 1 tooth would barely be noticeable. It would make sense if I could get a 13-14 teeth on the smaller ring and 17-18 on the larger ring, but so far I havenít found anything online if this sort.
Thanks !
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Old 10-21-17, 01:03 PM
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Old 10-21-17, 01:10 PM
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Riv Bike built a double chainring bike with a Flip Flop rear wheel , so you used 1 side with one chainring and one side with the other.

Match the smaller chain ring with the larger cog smaller cog on larger chainring, but the tooth count total for each must be the same
or the chain will be too long or short to get it in the range of adjustment your dropout slot allows..



Brompton has a 2 cog freehub opiion..
....
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Old 10-24-17, 04:27 AM
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SA makes the S2K setup for a disc brake, with 135 mm spacing.

Sturmey-Archer | S2K Silver

http://www.sturmey-archer.com/files/...0S20%20S2S.pdf

Last edited by pcf; 10-24-17 at 06:49 AM.
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