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Please Help - Finding Replacement Rear Axle for Panasonic 12 Speed 3/8 or 10mm?

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Please Help - Finding Replacement Rear Axle for Panasonic 12 Speed 3/8 or 10mm?

Old 02-05-14, 12:02 PM
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Sport Sonic
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Please Help - Finding Replacement Rear Axle for Panasonic 12 Speed 3/8 or 10mm?

What I thought to be a simple job to replace this turned out to be a real ordeal.
Can anyone advise what is the correct replacement axle for this bike? It's a Panasonic Sport 1000 12 speed with a Shimano 6 speed freewheel. The original axle is 170mm length with 26tpi. I've gone to 3 different bike shops, 1 could not find a suitable replacement and suggested I replace the the entire wheel/freewheel with a modern unit(!?). 2nd suggested I most likely needed a 3/8" x 26tpi and had referred me to a 3rd shop in the area that had a used one in stock. The axle they had was severely damaged at the threads, and I could not screw my hardware in all the way. The threads did match up fine though and apparently this was a 3/8 dia axle.

I ended up sending my original axle to a reputable online supplier, who 'matched' it up and sent me a 10x26x174 solid axle with a cone. Now, their cone they supplied threads onto my original( although with very slight play) and threads on to the new axle fine. BUT, when I try and transfer my original cones and hardware I can't even get the threads started. I contacted them back and they advised that they measured my original axle to be a 10 x 26tpi axle and there is not much else to be done. I have now sent them back my original along with their replacement with cones so they can see for themselves. Has anyone replaced one of these axles before and can you verify that it's indeed a 3/8's? I find it hard to believe that they can't figure this out!
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Old 02-05-14, 12:49 PM
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I think it is a 3/8 x 26 tpi unless there is something odd about the hub. Is there any model information on it? It is a solid axle right? (it uses a regular nut to hold the wheel rather than a quick release.

QR / Hollow rear axles are usually 10mm w 26tpi and solids are typically a but smaller.

https://www.niagaracycle.com/categori...0mm-7-8s-7-8sp
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Old 02-05-14, 02:55 PM
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Correct, it's a solid axle. The hub is original Shimano, nothing special. Threaded nut/cone with spacers on the drive side. That one in the link looks slightly diff by the hardware, and the threads on mine don't run all the way through center(although this wouldn't really matter).
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Old 02-05-14, 03:12 PM
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The important thing is the size. If you need to by a whole axle set to get the proper size that is what you need to do. You just use your cones and spacers.

I can't think of where Montvale is but we have lots of members in NJ, maybe someone will offer to help.
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Old 02-05-14, 03:13 PM
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There are 5 pages of axles at Niagara. You can order more than 1 at $2.50-$5.00 each. If I replace the axle, I replace the hardware on it as well.

https://www.niagaracycle.com/categori...?sort=priceasc
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Old 02-06-14, 11:26 AM
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Thanks for the links, and I don't mind replacing all the hardware. Do the dust caps really matter? Would these dust caps that come with these axles fit on my hub or can they be removed?
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Old 02-06-14, 10:16 PM
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Originally Posted by Sport Sonic View Post
Thanks for the links, and I don't mind replacing all the hardware. Do the dust caps really matter? Would these dust caps that come with these axles fit on my hub or can they be removed?
Shimano really tends to design things to their own standards, such as cones and especially sealing bits.

But it's almost certainly a 3/8" dia axle, I've never found a Shimano solid-axle freehub with any other axle diameter, even though those hubs are more often sold with Quick-release 10mm axles.

10X26tpi axle is wrong, since that's Campagnolo's threading and Shimano never copied it. Shimano did use 10x25.4tpi threading for their quick-release freehubs..

The question is whether your axle is 3/8x26tpi or possibly 3/8x25.4tpi solid axle. You can easily line up the threads to any new axle to check for matching pitch before buying, but not online.

Be aware that Niagara may charge full shipping rate for each axle, even if you buy 5 or just two. That seems to be how their pricing is arrived at.

My advice is to definitely keep (and keep track of) your axle hardware and find the correct-thread axle. I keep parts from many discarded bent wheels around for that purpose, just as I keep a wide assortment of cartridge bottom brackets, many just barely-serviceable, for determining what bb will fit best with a particular frame and crankset.
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