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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 04-24-11, 11:31 AM   #1
AngelGendy
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Converting a 70's Ross to fixed

I have to admit when I first heard about fixed gears I thought "why" but now that my Ross is going to be playing second fiddle to my Specialized Allez Pro, I thought "why not"

The only real questions I have are about gearing, I have two crank sets to choose from, both are 170mm, both have 52/40 sprockets. So far in my reading about the subject I have understood shorter than normal cranks is better, my normal length is 175mm.

I can remove the 40 tooth sprockets from both, but the 52 tooth are not removable.

So I'm thinking of going with a 40/17 gearing to start with, and just leave the 52 tooth alone.

The largest cog I can find is a 21 tooth so I don't think a 52/21 will work.

any thoughts?


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Old 04-24-11, 12:02 PM   #2
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40 to a 16 would be great. I run 46/16 and It either kicks my butt or feels great to me.

Cut the higher gears off with a hack saw. Leave the 40 tooth. If you really want, remove the cottered crank and replace it with a tapered. But it's hard to even find a good cheap tapered without the bike already having it.

also, 52/21 would be about the same as 40/16, but if it works out for you, stick to 52/21. I don't know about your chain, but you might need to get a new longer one.
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Old 04-24-11, 12:03 PM   #3
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Normally the choice between using the inside or outside chainring is based on which of them will give you the best chainline with the rear cog. Typically the inside chainring works best when using a road double crankset with a road bottom bracket spindle length. As to gearing, it seems to me that 52 x 21 is already pretty low, but 22T cogs are available if you really want to go that low.
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Old 04-24-11, 12:24 PM   #4
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That's why I'm thinking of starting with the 40/17, for chainline mainly, I know I may end up getting another cog or two before I'm done.

Both cranks are SR square taper.... I'll use whichever gives me the best chainline

#1 is a cheapie stamped and riveted...





#2 is a little better quality..



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Old 04-24-11, 12:48 PM   #5
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Looking at these 2 cogs...

http://cgi.ebay.com/KT-TRACK-FIXED-G...ht_2094wt_1150

http://cgi.ebay.com/Fixed-Gear-Track...#ht_1711wt_907

I'm thinking steel...
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Old 04-24-11, 01:16 PM   #6
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Aluminum cogs wear out very quickly and aluminum lockrings are prone to stripping. Definitely get steel. Also, stay away from cheap stamped steel cogs; pay a bit more and get machined and hardened steel cogs and lockrings.
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Old 04-24-11, 01:54 PM   #7
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I can't seem to find any steel ones that aren't stamped...
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Old 04-24-11, 02:08 PM   #8
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I can't seem to find any steel ones that aren't stamped...
Try here >>> http://www.retro-gression.com/product/track-cog

>>> http://www.retro-gression.com/produc...teel-lock-ring
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Old 04-24-11, 02:29 PM   #9
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Thanks, shipping is reasonable too!
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Old 04-24-11, 07:20 PM   #10
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If your just riding it around town, 40x16 would be a great ratio. As long as you don't go down a big hill (huuugggee cadence)
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Old 04-29-11, 11:48 AM   #11
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It says the lock ring is left hand threaded so that's for a track hub right?

http://www.retro-gression.com/produc...teel-lock-ring


On another note I needed to replace my front rim so I placed an add on CL and I just brought home a set of Wolber modelle 58 Super champion 36H 27" complete wheels with a 6 spd freewheel and skewers the front hub says "MALLARD Made in France", rear has a sticker that says "Helio Matic Peugeot"

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Old 04-29-11, 03:51 PM   #12
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I ordered the 16T from retrogression, they answered the question about the lock ring, I just need to check the LBS for a BB lockring to use.

Next question will the Frenchie hub still have the English threads? the Freewheel has the goofiest multi splined nut I've ever seen.... I thought Suntours were bad!

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Old 04-29-11, 07:34 PM   #13
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Sheldon suggests that French-threaded hubs are extremely rare. More detail about the heliomatic, here.

Aye, so BB lockring. You're going suicide?
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Old 04-29-11, 08:00 PM   #14
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So, how do you plan on mounting a threaded cog on a heliomatic hub?
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Old 04-29-11, 08:39 PM   #15
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Sheldon suggests that French-threaded hubs are extremely rare. More detail about the heliomatic, here.

Aye, so BB lockring. You're going suicide?
No I'm keeping the brakes!

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So, how do you plan on mounting a threaded cog on a heliomatic hub?
I wasn't sure what it was until I read the article, I'll probably search ebay for a suitable 36h hub for a replacement in the future. I only needed the front wheel anyway.

IT could be an excuse to get a proper track hub.........

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Old 04-29-11, 08:53 PM   #16
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The smallest cog screws on, yes? Unless it's some kind of Mallard propriety size.

Granted, chainline would be ridiculous.

Best off lacing in a decent hub.
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Old 04-30-11, 06:05 PM   #17
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OK so now I'm getting a Flip flop hub to lace into the Wolber rim, should I go with 16t/18t? or will I have enuff room in my 3.5 cm dropout to go 16t/19t?

In the meantime I have the stock rim ready for my 16t cog, and have a BB lockring.

Don't mind the dirt.....

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Old 04-30-11, 06:40 PM   #18
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will I have enuff room in my 3.5 cm dropout to go 16t/19t?
Yes. You need about 1/8" (.32mm) per tooth change in the dropout, so 3 teeth is about 1 cm. You've got plenty of room.
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Old 05-05-11, 03:50 PM   #19
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Looks like the Post Office delivered my 16T today, so I may be making a ride around the block tonight, should I be using my clippless pedals?
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Old 05-05-11, 06:11 PM   #20
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I got the chain on, need to trim my axle about 4mm, and put new bearings in the front hub, and I'm ready to go!

Chainline with the 40/16 looks great! but I'll wait a few miles before I cut off the 50T.
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Old 05-05-11, 07:25 PM   #21
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Old 05-05-11, 08:08 PM   #22
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It's getting too late to ride her.... do I dare take the maiden voyage on the way to work tomorrow?

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Old 05-05-11, 08:36 PM   #23
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It's getting too late to ride her.... do I dare take the maiden voyage on the way to work tomorrow?


I say do it, worst that can happen is you fall
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Old 05-06-11, 11:06 AM   #24
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I chickened out! I'll give a ride report after work today!
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Old 05-06-11, 06:03 PM   #25
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First ride report:

How do you all do it? I kept wanting to coast, but the bike wouldn't let me! At one point I got going fairly fast and got scared and took my feet off the pedals (note to self.... don't do that)

I was afraid to use my clipless, but I think they will be an advantage.

Don't get me wrong I loved it and am looking forward to many miles! The 40/16 combo seems to be just about right, and I should be able to tackle most of the hills around here. I'll get a 19 for the other side once I build my flip/flop wheel.


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