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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)

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Old 02-19-07, 11:00 PM   #1
sanjosedowntown
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new to fixies, help me?

I have a Performance frame a bought at goodwill complete for 25 dollars, i've recnetly painted it black and ripped everytihng off and am trying to convert it to a fixie. The problem is i cant really afford flip flop rims right now, but would like to get the conversion spacers for my 6speed hub, but not sure what kind. I"m also very confused on what cranks, BB and chainring to get? can anyone reccomend some parts for me that will help me not waste money, by not knowing all the information on these bikes.

I don't want to spend more than 50 for cranks, and would like a cheap Bottom bracket. They also need to be black.

What kit should i get for my 6speed hub to convert it to a fixed gear?

what chain is worth getting?



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Old 02-19-07, 11:06 PM   #2
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Everything you need to know: http://www.sheldonbrown.com/fixed-conversion.html
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Old 02-19-07, 11:08 PM   #3
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shimano un52 or similarly cheap jis bb, fmf or similarly cheap bmx cranks (see http://fmfbmx.com/Merchant2/merchant...ategory_Code=C) and then some chainring from the parts bin or search around for a black one if that still matters to you. should be under 50 for everything if you play your cards right
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Old 02-19-07, 11:57 PM   #4
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I don't think many 6-speed cassettes were ever made; you probably have a thread on freewheel. You can build a suicide hub out of that with little effort.

That said, if you are riding a bike with absolutely none of the seatpost showing, then said bike is too big for you. I understand economic constraints limit people's options, but you will enjoy your bike thirty times more when it fits you properly. Either that, or you're suffering from what I like to call "American riding-position". This involves riding with the seat at a height where the top of the pedal stroke will place your knee at the level of your shoulder. Uncomfortable and most certainly wrong.
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Old 02-20-07, 12:09 AM   #5
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if it is a cassett you could get a surly fixxer
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Old 02-20-07, 12:14 AM   #6
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The conversion kits you see sold are for freehubs, you have a freewheel so your only option is a suicide hub. Therefore you need brakes. The spacers you need are axle spacers, shops have them or be ghetto and use washers -- sheldon explains what to do with them. $50 is not happening unless you get the deal of the century on everything or you have access to a good parts pile or a co-op. Here's what you need:

Track cog: $20 minimum (rockwerks, IRO)
BB lockring + loctite + spacers: $5ish
Chain: $10 (SRAM PC1 for 1/8" drivetrain, any chain in the universe for 3/32")
Cheap cranks: $20 (FMF or bulletproof, BP is $10 more and probably worth it)
Cheap Chainring: $15 (rocket ring or other "universal" ring)
Single stack bolts: $5
BB: $15
Pedals, clips, straps: $40 (mks is your friend)
Front brake, cable, and lever: $10 for old road stuff, more like $50 for even the cheapest new stuff
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Old 02-20-07, 12:27 AM   #7
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hey guys thanks for the quick response. the seat is just sitting in that possition, the frame is actually perfect for my size. 50 dollars was just my crank limit. i'm willing to pay more for the everything else.

i have the brakes and a handle already.

is there any way to make it fixed gear?
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Old 02-20-07, 12:35 AM   #8
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Quote:
Originally Posted by sanjosedowntown
hey guys thanks for the quick response. the seat is just sitting in that possition, the frame is actually perfect for my size. 50 dollars was just my crank limit. i'm willing to pay more for the everything else.

i have the brakes and a handle already.

is there any way to make it fixed gear?
I can't tell from those pictures, but other posters seem pretty confident that it's a freewheel. What that means is that you can take the casette (sprocket assembly) off the rear hub (there are various tools for removing different kinds of freewheels; either look online or ask your LBS) and be left with just threading (the ratcheting mechanism is inside the casette, as opposed to a freehub). If you were so inclined, you could then screw a track cog onto this threading and have a fixed gear.

HOWEVER: Track hubs have both this threading (for the cog) and another set of reverse threads for a lockring. What this means is that with both a cog and lockring attached, back pressure won't unscrew the cog because it will put pressure on the lockring, which won't unscrew since it is reverse-threaded. You can put a bottom bracket lockring on the hub you have since they're not reverse-threaded, you can put locktite on the threads of the hub, and you can rotafix (http://204.73.203.34/fisso/eng/schpignone.htm) the cog on really tightly, but I've never done this and am not endorsing it.
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Old 02-20-07, 12:48 AM   #9
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i like those fmf cranks, with an isis bottom bracket. but how do i know what size to get and if the isis bb will fit on my bike.

gavin
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Old 02-20-07, 12:50 AM   #10
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i guess i should mess around with the hub before i figure out what to do with it. I'm going to take it off and post some pics of what it actaully is.
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Old 02-20-07, 01:03 AM   #11
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wheels sets can be had on ebay for around 150
fmf crank arms 20
shimano un-52~53 68x107 20-35
bar tape 10
cable and brake shoes 15

rockin the beater on the cheaps priceless
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Old 02-20-07, 08:05 AM   #12
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Best cheap wheels you will find on the internet:

http://shop.greatdealsonbikes.com/me...tegory_Code=TR
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Old 02-20-07, 08:41 AM   #13
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Quote:
Originally Posted by sanjosedowntown

is there any way to make it fixed gear?

Not to be rude, but this post proves you didn't read the Sheldon Brown page. Please go do that before asking any more questions, I guarantee everything will be much clearer.
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Old 02-20-07, 09:02 AM   #14
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Quote:
Originally Posted by sanjosedowntown
i like those fmf cranks, with an isis bottom bracket. but how do i know what size to get and if the isis bb will fit on my bike.

gavin
i third the recommendation that you get nice and familiar with sheldon's page, it has pretty much all you need.

the good news is that the ideal bb length depends on your chainline (http://www.sheldonbrown.com/chainline) and that in turn depends on how your hub is spaced in the dropouts. since you're going to be respacing your hub anyway, you can just buy a 110 or 107mm wide bottom bracket and space the hub so the sprockets line up.

if the frame's performance, the bb is almost certainly 68mm shell english threaded. this is more or less standard, and most isis bb's you find will work. just remember, 68mm shell, 107/110mm length, english threading. i'd clean out the threads in the frame with some simple green and a toothbrush before trying to screw a new one in.
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Old 02-20-07, 11:38 AM   #15
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thanks, i'll order my cranks. i have read sheldons page, i was just asking for some diy tips.

what do you guys think of this wheel set

http://shop.greatdealsonbikes.com/me...tegory_Code=TR

or this one

http://shop.greatdealsonbikes.com/me...tegory_Code=TR
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Old 02-20-07, 11:52 AM   #16
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go for the suns they have the sealed hubs
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Old 02-20-07, 12:03 PM   #17
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if i went with the sun rims, FMF cranks, and isis bottom bracket. what size bb would i get?
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Old 02-20-07, 12:33 PM   #18
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I can't speak to the sun or weinmanns, but the wheelsets that guy sells with the mavic CXP22's are really nice. I know they're a little more, especially for black, but if I was buying them I'd scrounge up the $20. Otherwise, the suns don't look like they have machined braking surfaces, they'll start pretty but they won't stay that way.

Call FMF about the crank length.

Retem, they're both sealed formulas
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Old 02-20-07, 12:48 PM   #19
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Quote:
Originally Posted by sanjosedowntown
if i went with the sun rims, FMF cranks, and isis bottom bracket. what size bb would i get?
The sun rim wheelset incorporates a Formula track hub in the back. Most track hubs place the rear cog 42mm off the bike's centerline. You want the front and rear cog to be in line with each other. Therefore you want whatever bb spindle length places your front chainring 42 mm off centre. If you get one too long, your chainring will be too far to the outside/ right; if you get one too short, your chainring will be too far to the inside/left.
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Old 02-20-07, 12:52 PM   #20
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i did a quick search for fmf chainline and didn't find any. i think the suggestion of emailing the company is the way to go.
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Old 02-20-07, 12:55 PM   #21
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google fmf cranks chainline and youll find that bfssfger schnee has figured out what to do with these cranks. *edit* with a different version... oh well.
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