fixed gear conversion
06-23-09, 09:12 PM
#1
Fresh Garbage
Thread Starter
fixed gear conversion
Hi all
So after months of procrastination, I finally ordered the hub and rim for my fixed gear conversion and I started to think of the build. The rear drop out spacing is 135mm and the hub is 120mm. I have an old steel frame and I realize I will have to compress the rear triangle to fit the hub. How do I go about doing this accurately? Is there a tool that will evenly pull both sides of the frame inward or is this a job to be done by hand and eye?
So after months of procrastination, I finally ordered the hub and rim for my fixed gear conversion and I started to think of the build. The rear drop out spacing is 135mm and the hub is 120mm. I have an old steel frame and I realize I will have to compress the rear triangle to fit the hub. How do I go about doing this accurately? Is there a tool that will evenly pull both sides of the frame inward or is this a job to be done by hand and eye?
06-24-09, 02:29 AM
#2
Arrgghh me hearties!
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It's important to respace each side individually by 7.5mm, rather than just compress the rear triangle and hope that the left and right are adjusted by the same width.
Find a way to respace the left triangle, until the width is reduced to 127.5mm. Then, flip over and work on the right triangle until the gap reaches 120mm.
Sheldon Brown has instructions on exactly this: https://www.sheldonbrown.com/frame-spacing.html
Find a way to respace the left triangle, until the width is reduced to 127.5mm. Then, flip over and work on the right triangle until the gap reaches 120mm.
Sheldon Brown has instructions on exactly this: https://www.sheldonbrown.com/frame-spacing.html
Last edited by damian_; 06-24-09 at 02:30 AM. Reason: bad grammar
06-24-09, 04:14 AM
#3
Perineal Pressurized
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Hi all
So after months of procrastination, I finally ordered the hub and rim for my fixed gear conversion and I started to think of the build. The rear drop out spacing is 135mm and the hub is 120mm. I have an old steel frame and I realize I will have to compress the rear triangle to fit the hub. How do I go about doing this accurately? Is there a tool that will evenly pull both sides of the frame inward or is this a job to be done by hand and eye?
So after months of procrastination, I finally ordered the hub and rim for my fixed gear conversion and I started to think of the build. The rear drop out spacing is 135mm and the hub is 120mm. I have an old steel frame and I realize I will have to compress the rear triangle to fit the hub. How do I go about doing this accurately? Is there a tool that will evenly pull both sides of the frame inward or is this a job to be done by hand and eye?
That's almost six tenths of an inch, quite a bit in my opinion. Not to rain on your parade, but I would have gotten a fixed hub that had 135 mm old, or at least 130.
Depending on the hub you did get, you might be able to replace the axle and add some spacers.
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This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
06-24-09, 07:47 AM
#4
Real Men Ride Ordinaries
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just do it, the steel can take it.
I don't think you have to worry about alignment either because your not compressing the stays so much as pulling them together towards a central point.
I don't think you have to worry about alignment either because your not compressing the stays so much as pulling them together towards a central point.
06-30-09, 06:49 PM
#5
Fresh Garbage
Thread Starter
OYE I measured my frame incorrectly. It's 125mm
the space is so small, I'll just put spacers between the cones and the lock nuts. Does anybody have any experience with having done this?
the space is so small, I'll just put spacers between the cones and the lock nuts. Does anybody have any experience with having done this?
Last edited by hairnet; 06-30-09 at 07:07 PM.
06-30-09, 07:34 PM
#6
Your mom
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Yep. It's as easy as it looks, just make sure it's symmetrical. Also, good luck finding spacers at your LBS unless they do a lot of SS conversions. I have a big box of hardware store washers in the toolbox that I use. Can't remember what size, but it's easy. Doesn't look so pretty, though.
06-30-09, 07:53 PM
#7
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Thread Starter
I'm going to the hardware store for the 5/8" washers. If I really started to care for the look of the hub I can take the washers to a belt sander and paint it black.
Im just having a little trouble finding info on the construction of hubs. Do they go cone-> dust cap-> spacer-> inner lock nut-> outer lock nut?
Im just having a little trouble finding info on the construction of hubs. Do they go cone-> dust cap-> spacer-> inner lock nut-> outer lock nut?
07-11-09, 08:03 PM
#9
Fresh Garbage
Thread Starter
Thank you guys for helping me on my newbie questions
Here is the final product
Here is the final product
07-11-09, 11:02 PM
#10
aka Tom Reingold
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Congratulations! Well done!
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Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog
“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author
Please email me rather than PM'ing me. Thanks.
07-12-09, 08:39 AM
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Looks good! I have the same thing going up front with two brakes but only one of them connected. I lean on the other when climbing so I don't really want to take it off.
