bergerkjh

bergerkjh

Colnago Mixte

You can get the lock ring and drive sprocket off with some channel lock pliers, or other improvised tools, I would think.

Switching out the cog would be your best bet. Existing chain SHOULD work. You can get a 17 cog for a lot less than $30.

If you swap the chainring, you'll need the chainring, plus I'm 99% sure you will need a new chain too.

bergerkjh

Colnago Mixte

You really ought to get a chain whip though, for removing sprockets. You'll use it, guaranteed. And that sprocket might be screwed down pretty tight.

Plus, I don't wanna give the board mechanics fits by saying to use channel locks.

Colnago Mixte

Here's a cheap ebay 17 cog, in 1/8th inch: https://www.ebay.com/itm/17T-FIXED-G...4AAOSwopRYiWVY

And one in 3/32nd https://www.ebay.com/itm/FIXED-GEAR-...kAAOxy-gBR9epQ

labcoat

Sounds like you could use a tool that would do everything you need.

https://www.retro-gression.com/colle...-lockring-tool

If you take it to a shop you going to pay that much.

if you want to try a 16 t cog I know were you can get one cheap

https://www.retro-gression.com/colle...ts/2-dolla-cog

Colnago Mixte

It occurs to me you might just use the chain itself to get that sprocket off, just mount the wheel in the dropouts and pedal backwards.

mrmb

I would be more focused on putting myself in a better economic position that way I am not having to worry about $30 here, $30 there.

TMonk

^
well that's more than a little presumptuous...

edit: and rude

Colnago Mixte

Get sloppy with how you spend $30, how well are you gonna handle $30,000, which you will probably never have, because you wasted all your money on $30 sprockets.

DFTT

TMonk

^
that's right, frugality is a virtue.

hardboiled718

I would advise against this. Using channel lock plies (unless modified in some way to access the cutouts of a lockring) to try removing a lockring and cog will probably just end up ruining both.

OP, if you'd rather not invest in any additional tools to do the job yourself, paying a bike shop to swap out a cog shouldn't be expensive or time consuming.
Also moving form a 48 to 52 tooth chainring is moving the ratio up, not down, which means it'll be harder to pedal. Reducing wear by using larger gears usually refers to the size of the rear cog, you don't see any less wear on an extra 4 teeth up front. Also just having 5 holes on the chainring doesn't mean it'll match because the BDC may not be the same. Better off just checking out a LBS.

hardboiled718

lol, seriously? also a terrible idea

Although the rotafix method might be a safer alternative since you're not actually riding the bike, but you can potentially scratch the frame.

bergerkjh

REDMASTA

79pmooney

You say you've been riding fix gear a long time. On this bike, chain and cog? Stuff breaks, even fix gear stuff. Breaking a chain could cost you a lot more than $30 if it causes a crash. (Even if you consider the pain of injuries to you "free".) The money you spend on a chain whip and proper lockring spanner will be, over the long haul, money well spent.

The chain whip Colnago Mixte showed in post #5 looks like a good one. You can make you own far cheaper with 1 x 1/8 flat bar from Home Depot, some 1/8" chain and a couple hours access to a friend's drill and file and a chain riveter. You can make the homemade chain whip a lot longer than the one shown which may be a real blessing when it comes to getting you cog off. .(It was screwed on when? Were the threads greased? How many miles and hard hills have you done on it?)

I made my crude chain whip from a 3' bar scrap 40 years ago, Never regretted it. I've used various spanners. The Pedros Trixie fix gear tool is the best I've used (and works far better than any of the plate steel spanners if you ever decide to get fancy and run wild gears like 12 tooth cogs and their required bell shaped lockrings). It also doubles nicely as a hub wrench; very useful for those of us who sometimes get flats on the road on our fix gears,

This is just simple advice on riding fix gears from someone who was in close to your shoes when he started, fell in love with fix gears and never stopped, Many years later I could afford the fix gears I really wanted, own 3 and now change cogs for different rides frequently. Still have and use that (what, $5?) homemade whip.

Ben

TimothyH

OP lives in NYC. Surely someone in the Big Apple has a chain whip and lockring tool and be willing to help the OP out.

New Yorkers are pretty chill nowadays. Just walk up to a bunch of guys on FG bikes and be like, "Hey, can someone help me out?" The worst that can happen is they say no. If he was in Atlanta I'd do it for him yesterday.

@bergerkjh, have a look at Bike Recyclery. They sometimes have nearly new or NOS cogs for cheap.


-Tim-

TMonk

^
good ideas right there

mrmb

Bikes are an investment. Time is valuable. A bike that runs well is valuable. $30 is chump change.

Colnago Mixte

No, the worst thing that could happen is that the person would say no, and then start a thread here about how some random person he didn't know, had the audacity to attempt to speak to him without being spoken to first, and not only that, wanted to borrow his tools.

And that thread will rage on for weeks, and eventually get locked.

TMonk

We can always lock it now if you're in a hurry

TimothyH

TMonk

just messin' haha

back on topic though again I'll advocate your most recent response @TimothyH. It involves getting into the local cycling community which is always a good thing IMO.

Mikefule

I ride 49/17 on 700c x 23mm tyres and find it versatile. I live in a flattish area but I have got up the biggest local hills on this ratio. I ride with brakes so I don't have to rely on back pressure to control speed on the descents.

To remove the lock ring, ideally you need a C spanner of the right size. In practice, it is usually possible to tap it round with an old screw driver and a mallet. If you do that too often, it'll cause damage, but if it's only now and again it's OK.

I have always been able to remove the sprocket by putting a sudden hard shock through the pedal. Just keep the bike on the ground and apply all your weight suddenly to the pedal in the obvious direction.

All these tools are reasonably cheap, readily available, and easy to use. Why pay a LBS to do the job, when you could spend the same money on a tool and do the job yourself this time and every time after?

A change of 1 tooth on the sprocket will always make a bigger percentage difference than a change of 1 tooth on the chain ring. For example, 1/17 difference is bigger than 1/48 difference.

You can increase the gear ratio by putting on a bigger chainring but you will need more chain. You can increase the gear ratio by putting on a smaller sprocket. For 1 tooth difference, you may not even need to shorten the chain. Yes, there is an argument that two larger cogs will be smoother than the same ratio achieved through two smaller cogs. On the other hand, the two smaller ones will be lighter. As there are no hills in NYC, weight is not really an issue for you.

Chain rings come in different thicknesses and I think this depends on whether they are designed for a 1x, 2x or 3x set up. The differences are slight, but I had one once that never sat right on my single speed.

Chain sets come in 4 or 5 arm varieties, but there are also different "BCD". That stands for "bolt circle diameter". The 4 or 5 bolts are evenly spaced around a circle. You need a chainring that is drilled with the same BCD as the chainset. The two common BCDs are 130mm and 110mm.