Fixie / SS Gear to choose

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Fixie / SS Gear to choose

Postby .isaac. » Tue Sep 07, 2010 6:44 am

What gear should I choose?
I cycle about 6 kms to school and I sometimes ride 20-30 kms into to city, down to docklands and back.
I want to go relatively fast such as 10-30 kms/h.
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by BNA » Tue Sep 07, 2010 7:06 am

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Re: Fixie / SS Gear to choose

Postby jimsheedy » Tue Sep 07, 2010 7:06 am

Well if you wanna go fast on the flat go as large as you want. If you've gotta ride up some hills. 48 - 19 is pretty standard. good acceleration from a standing start and relatively easy to pull up. Remember also the larger the gear the harder it is to pull up. You don't wanna wreck your knees first time out.


plenty of info here.

http://www.sheldonbrown.com/fixed.html#bigsmall
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Re: Fixie / SS Gear to choose

Postby rkelsen » Tue Sep 07, 2010 10:29 am

As above, how flat is it?

46/18 isn't a bad choice, and will get you to 30kph at about 95rpm.
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Re: Fixie / SS Gear to choose

Postby bunchridefinder » Tue Sep 07, 2010 10:33 am

rkelsen wrote:As above, how flat is it?

46/18 isn't a bad choice, and will get you to 30kph at about 95rpm.


+1, thats what I run, and its gold!
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Re: Fixie / SS Gear to choose

Postby brauluver » Tue Sep 07, 2010 4:04 pm

Plug all your possible combinations into this along with correct wheelsize and it will tell you speeds at RPM's on the right side http://software.bareknucklebrigade.com/
helped me out heaps in the early days
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Re: Fixie / SS Gear to choose

Postby .isaac. » Tue Sep 07, 2010 9:13 pm

That is quite an interesting piece of software.
The only problem is I haven't bought my cranks yet so I don't know the length of them.
It requires you to put it in to a text field.
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Re: Fixie / SS Gear to choose

Postby tomns » Tue Sep 07, 2010 9:20 pm

Just put 175mm - pretty standard crank size

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Re: Fixie / SS Gear to choose

Postby brauluver » Tue Sep 07, 2010 9:39 pm

EvilGenius wrote:That is quite an interesting piece of software.
The only problem is I haven't bought my cranks yet so I don't know the length of them.
It requires you to put it in to a text field.


That wont effect your gear inches any way, only your gain.But default to 175 unless you plan on using a more track friendly 165 to avoid pedal strike when riding fixed.
Rim and tyre size do change the gear inches however.Even a smal dif between say 700/23 and 700/25.
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Re: Fixie / SS Gear to choose

Postby europa » Tue Sep 07, 2010 10:04 pm

Start with a modest gear ratio, say 65 gear inches. Apart from being easier to ride forwards, it's far easier to learn how to brake using your legs with a lower gear. You'll soon work out for yourself what to go for next and when to do so.

Most people seem to ride around 70 gear inches - it's like taking off in too high a gear on your geared bike but not excessively so, gives a reasonable speed on the flat, allows you to control your speed with your legs without ruining your knees and gives a decent top speed. For a flat road, it gives a cadence of about 90 at about 30km/hr. Get used to that and your legs will tell you if you want more or less.

Crank length - 165-170 mm will work best. The problem with fixed gear is that the pedals are always turning so you run the risk of a pedal striking the ground. You learn to ride around this and it ceased to be a problem, but 165-170 should give you all the ground clearance you need unless you're on a frame designed for longer cranks.

The shorter cranks are also easier to spin and that's important in fixed gear riding - you will be pulling cadences you normally wouldn't on your geared bike when going down hill and being able spin smoothly is an important skill.

USE BRAKES. I know, it's cool not to have them and maybe one day you'll have the skills to ride brakeless, but when your legs are cold or tired and you need to stop NOW, brakes work a treat. Personally, I use the brakes pretty much as I would on a freewheel bike only a lot less so because I'm also controlling the speed with my legs. Stopping using your legs alone will eventually muck up your knees - how quickly this happens depends on how high your gear is, so start with a low gear to learn the skills first, then build up gradually.

There are a lot of ifs and buts and 'what suits you' in this post, but that's exactly what fixed gear riding is like - it's highly individual.

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Re: Fixie / SS Gear to choose

Postby hartleymartin » Tue Sep 07, 2010 11:48 pm

Start with 48/20 or 48/19. My friend started with 48/21 and she now rides 48/17 (she lives in Canberra though)

Most people seem to be happy with a gear in the high-60's to low 70's (about 66 to 72 gear inches)
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Re: Fixie / SS Gear to choose

Postby .isaac. » Wed Sep 08, 2010 7:37 am

europa wrote:USE BRAKES. I know, it's cool not to have them and maybe one day you'll have the skills to ride brakeless, but when your legs are cold or tired and you need to stop NOW, brakes work a treat. Personally, I use the brakes pretty much as I would on a freewheel bike only a lot less so because I'm also controlling the speed with my legs. Stopping using your legs alone will eventually muck up your knees - how quickly this happens depends on how high your gear is, so start with a low gear to learn the skills first, then build up gradually.


I'm actually building a single speed so I need brakes anyway.
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Re: Fixie / SS Gear to choose

Postby Crawf » Thu Sep 09, 2010 1:07 am

69 dude, both my bikes have it.
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Re: Fixie / SS Gear to choose

Postby .isaac. » Thu Sep 09, 2010 6:30 am

Jacobite wrote:69 dude, both my bikes have it.


Sorry but I'm not reading you.
Can you explain?
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Re: Fixie / SS Gear to choose

Postby brauluver » Thu Sep 09, 2010 9:11 am

EvilGenius wrote:
Jacobite wrote:69 dude, both my bikes have it.


Sorry but I'm not reading you.
Can you explain?


he means 69 gear inches ,the delivery is a reference to an 80's movie called bill and ted.You may be little young.Ask your parents.

1 min 39 into this vid http://www.youtube.com/watch?v=xrGWooNDPiE

I like 71 Gi for street commuting duties
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Re: Fixie / SS Gear to choose

Postby robsta » Thu Sep 09, 2010 11:00 am

I ride an SE Lager. I changed the rear to 19 from 18. Made a subtle but welcome improvement. I have a couple of hills to deal with and the change in gearing meant I can get to the summit without pulling up on the bars.
I'm old enough to remember the movie. Just watched the clip from the previous post. Very funny. It was a movie that could make me laugh out loud
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Re: Fixie / SS Gear to choose

Postby europa » Fri Sep 10, 2010 11:34 pm

It's funny how much difference a single tooth can make. Never be scared to experiment, even with small things. Just remember, if it doesn't feel right, it probably isn't.

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Re: Fixie / SS Gear to choose

Postby .isaac. » Sat Sep 11, 2010 5:55 am

Ok.
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Re: Fixie / SS Gear to choose

Postby .isaac. » Fri Oct 08, 2010 7:47 pm

I think I may start with 42/16. I'm not sure why but I think I just will...
Also could someone please tell me if 42/16 is the same 2:6 on a normal geared road/MTB?
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Re: Fixie / SS Gear to choose

Postby munga » Sat Oct 09, 2010 11:54 am

ride your regular journey on your current bike and put your bike in a gear youre comfortable with, and when you get home, count how many teeth on your selected front ring and rear sprocket.
go from there
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Re: Fixie / SS Gear to choose

Postby .isaac. » Sat Oct 09, 2010 12:07 pm

I like 2:6 as a gear so i'll go down and count now.
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Re: Fixie / SS Gear to choose

Postby munga » Sat Oct 09, 2010 1:33 pm

no idea what 2:6 could be, but remember if youre riding a mtb now, your fixie will have bigger (diameter) wheels, which means your "2:6" is going to be harder work on the fixie
http://www.sheldonbrown.com/gears/
as mr sheedy and the beerman said, consult the calulators
oh, and when you buy your sprocket, think about buying another one while youre at it, but one tooth smaller
Last edited by munga on Sat Oct 09, 2010 4:05 pm, edited 1 time in total.
pitty43 wrote:Thanks all for your help. Better change my Gumtree add now.

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Re: Fixie / SS Gear to choose

Postby .isaac. » Sat Oct 09, 2010 3:25 pm

I think I'll just head on down to my LBS.
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Re: Fixie / SS Gear to choose

Postby HappyHumber » Sat Oct 09, 2010 3:28 pm

*scratching head*
What WAS that all about?
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Re: Fixie / SS Gear to choose

Postby Mulger bill » Sat Oct 09, 2010 6:37 pm

I get the feeling EG may mean 6th sprocket on the middle ring.
Of course, I could be wrong...
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Re: Fixie / SS Gear to choose

Postby ruscook » Sat Oct 09, 2010 7:18 pm

Last Sat I bought a Giant Bowery with a 48/17. So far really enjoying it. I ride it on the M7 cycleway (so far only between Sunnyholt Rd and Eliz Dr). On rolling hills like that the 48/17 works well.

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this is my first SS. I won't ride it fixed, but really liking the SS. It makes you work harder to keep a good average speed than on the normal roadie :wink:
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