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Pedal wrench question

Old 12-08-11, 07:02 PM
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Pedal wrench question

This might be a really dumb question but I can't quite figure it out for myself.

Is there any difference between a pedal wrench and a regular 15mm wrench? All I can see that even could be different between them is the thickness of the jaws. Obviously if my existing wrenches will do the job I'll save the money on buying a custom tool.
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Old 12-08-11, 07:06 PM
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Width and length, otherwise no. Although mine has 15mm on one end and 9/16" on the other.
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Old 12-08-11, 07:10 PM
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And while thin, there is more material around the jaws to stiffen it (compared to a 15mm cone wrench for example) for its intended task. If there is room on your pedals for a standard 15mm wrench, you don't need a pedal wrench.
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Old 12-08-11, 07:18 PM
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My pedal wrench is marked 9/16 & 15mm, but is almost twice as long as standard 15mm wrench which gives me a lot more wrenching force for rusted/seized pedals. It's also thinner and fits applications where standard wrench is too thick. I got my PW1 for $5, so it was a no brainer, but I don't think they are very expensive new. Is is a must have, I don't think so.
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Old 12-08-11, 07:45 PM
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I use whatever 15mm wrench that I find first. I do have a bottom bracket wrench that has a pedal wrench on the opposite side, but I almost never use it, although I do find that it seems to work better on the left threaded pedals.

-G
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Old 12-08-11, 07:55 PM
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Originally Posted by CACycling
And while thin, there is more material around the jaws to stiffen it (compared to a 15mm cone wrench for example) for its intended task.
IME (one data point out of three pedal wrenches I've owned), they're more likely for the flats to get buggered up than for the jaw to break.
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Old 12-08-11, 07:56 PM
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You need an 1/8" thick 15mm . for many pedals that is the space that you have available.

you might find a cheap open end wrench and thin it down on a bench grinder
(quench it in water often, so you don't heat it too much and take the temper out.)

Last edited by fietsbob; 12-08-11 at 08:53 PM.
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Old 12-08-11, 08:33 PM
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As already mentioned, the differences between a pedal wrench and a typical 15mm wrench are the thickness of the head and the length of the wrench.

I checked a couple of 15 mm wrenches that I have and the head thicknesses are about 7.5mm. The pedal wrenches run about 4 to 5mm, and for some pedals, a wider head than that won't fit.

The length of the 15mm wrenches are around 7" and the pedal wrenches are about 11", giving the pedal wrench considerably more leverage that I find is often needed.

I hadn't given this much thought before, but a 9/16" pedal thread a bit more than 14mm in diameter. If a 14mm bolt had a head on it, it would use a 22mm wrench. The 22mm wrench I have happens to be right around 11" long.

So, removing a pedal with a standard 15mm wrench is somewhat akin to trying to back out a 14mm bolt with a 22mm wrench that was cut down to 7"; the bolt would need to be loose, or you would need to be very strong to make up for the lack of leverage.
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Old 12-09-11, 04:46 AM
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Wow, 7 replies while I slept! Thanks everybody, I'll look to see if the wrench I already have will do the job and if not add a pedal wrench to my Christmas list
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Old 12-09-11, 06:14 AM
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This is the one I use, I have had it for 10-15 years:



https://www.rivbike.com/product-p/tl017.htm
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Old 12-09-11, 08:10 AM
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Most of my pedals have flats wide enough to use a conventional 15 mm openend wrench ans a couple require a thinner specific pedal wrench. What can't understand is installing pedals gorilla-tight. They have to be good and snug but that's plenty. Pedals are threaded so they do not loosen spontaneously under pedaling torque so they aren't going to get loose or fall off unless you leave them very loose. I always install them snug but a standard 15 mm wrench is plenty long enough and I've never had one come loose by itself. In fact, on my travel bike which requires removing the pedals for packing, I carry a Park RW-1 pedal wrench which is only 6" long and that has been plenty to install the pedals when I unpack the bike.
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Old 12-09-11, 08:30 AM
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Originally Posted by HillRider
I carry a Park RW-1 pedal wrench which is only 6" long and that has been plenty to install the pedals when I unpack the bike.
I'm sure the extra length is for help getting them off, not getting them on extra tight. It's kind of a tough area to wrench in, risk of racking your knuckles across the chainring, etc. so longer is safer and more convenient.
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Old 12-09-11, 09:44 PM
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Originally Posted by HillRider
What can't understand is installing pedals gorilla-tight. They have to be good and snug but that's plenty. Pedals are threaded so they do not loosen spontaneously under pedaling torque so they aren't going to get loose or fall off unless you leave them very loose. I.
+1. Also, I lube the threads liberally with grease. And a couple times a year, I break the threads free just to keep the threads active.
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