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Bianch Pista Front Axle Nut Size/Mercier Kilo TT Stripper Rear axle nut size?

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Bianch Pista Front Axle Nut Size/Mercier Kilo TT Stripper Rear axle nut size?

Old 02-20-21, 07:54 PM
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5 mph
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Bianch Pista Front Axle Nut Size/Mercier Kilo TT Stripper Rear axle nut size?

I put a new front Tire on my Bianchi Pista today. My guess is its a 2010. It was in storage for nine years and looked brand new when I got it.
When I remounted the front Tire, I noticed that one of the Front Wheel nuts was stripped.
I am rebuilding a Mercier Kilo TT Stripper and the Rear tire was sitting on my workbench.
I grabbed the Kilo TT Rear axle nut and it actually fit my Bianchi Pista Front axle.
Now I need to order a pair.
My questions is :are the Bianchi Pista Front Axle nut and Mercier KIlo TT Rear axle nut both 10mm x 1.0 thread?.
Because I read that the Pista front axle nut might be a Campagnola 10 mm 26TPI .
However you can calculate that a fastener with a TPI of 26 has a pitch in inches of 0.0384615 by dividing 1 by 26. Then, you can convert this to millimeters by multiplying it by 25.4 millimeters and end up with millimeter pitch as 0..9769 which is pretty close.
So Campagnola 26 TPI is pretty close to 10 mm x1.00 thread?
I am just asking, I don't know

Last edited by 5 mph; 02-20-21 at 09:48 PM.
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Old 02-21-21, 06:47 AM
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IAmSam
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Just so you know - I'm making this informative post here to keep myself from saying something snarky in another

You know what they say about making generalizations, but the general answer is M9 nuts in front and M10 in back. I don't know anything about your particular wheels, so remember that there are innumerable variations on this theme...

Good luck - ride safe

Last edited by IAmSam; 02-21-21 at 08:33 AM. Reason: dammit...
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Old 02-21-21, 04:56 PM
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Not a chance in Hell that a front wheel axle will have a 10mm diameter thread. What happens is that a 10mm nut will be a loose fit on a 9mm axle and appear to fit, but as soon as you apply any significant torque, you will damage the threads. Also, if the thread pitch is slightly dissimilar such as 1mm vs 26 TPI, then you will be able to thread the nut on initially for a few turns before it begins to bind, after which if you continue to tighten it you will again damage the threads. As to your Bianchi Pista, the hubs are not Italian, so the front axle is most likely 9mm x 1mm, and your Kilo TT rear axle is 10mm x 1mm.

Ref. Southerland's Handbook for Bicycle Mechanics, Third Edition, pages 11-2a and 11-3a.
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Old 02-21-21, 07:12 PM
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Originally Posted by 5 mph
When I remounted the front Tire, I noticed that one of the Front Wheel nuts was stripped.
I am rebuilding a Mercier Kilo TT Stripper and the Rear tire was sitting on my workbench.
I grabbed the Kilo TT Rear axle nut and it actually fit my Bianchi Pista Front axle.
Now I need to order a pair.
My questions is :are the Bianchi Pista Front Axle nut and Mercier KIlo TT Rear axle nut both 10mm x 1.0 thread?.
10mm front axles are not common, but they do exist. E.g. the original Shimano XT off-road hubs used solid axles, the front was 10mm with flats milled to fit a 9mm fork end slot. Who is the actual manufacturer of the hubs in question?

I read that the Pista front axle nut might be a Campagnola 10 mm 26TPI. [] So Campagnola 26 TPI is pretty close to 10 mm x1.00 thread?
26tpi pitch is close to 1mm pitch, but not close enough to work. A thin locknut, with only a couple threads engaged might work, but a cone with many threads engaged would jam long before you could thread it down far enough to work. The 26tpi thread pitch was only used by Campagnolo and a couple other Italian makes (Gipiemme, Ofmega, Miche), so unless you hubs were made by one of those companies, they're unlikely to be 26tpi pitch.

You can, in many cases, replace the entire axle set (axle, cones, locknuts) to get a working repair. Wheels Manufacturing offers a variety of axle sets that may be suitable replacements.
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Old 02-21-21, 08:43 PM
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Originally Posted by JohnDThompson
10mm front axles are not common, but they do exist. E.g. the original Shimano XT off-road hubs used solid axles, the front was 10mm with flats milled to fit a 9mm fork end slot. Who is the actual manufacturer of the hubs in question?

26tpi pitch is close to 1mm pitch, but not close enough to work. A thin locknut, with only a couple threads engaged might work, but a cone with many threads engaged would jam long before you could thread it down far enough to work. The 26tpi thread pitch was only used by Campagnolo and a couple other Italian makes (Gipiemme, Ofmega, Miche), so unless you hubs were made by one of those companies, they're unlikely to be 26tpi pitch.

You can, in many cases, replace the entire axle set (axle, cones, locknuts) to get a working repair. Wheels Manufacturing offers a variety of axle sets that may be suitable replacements.
The OP's bike is a cheap Italian Bianchi Pista track bike with cheap non-Italian (Alex Solo) hubs, so the front hub most likely has a 9mm X 1mm solid axle, unlikely to be 9mm X 26 TPI, and certainly not going to be 10mm. Anyway, all the OP needs is to find the correct set of front axle nuts, or at least one axle nut to replace the one that has stripped threads.
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Old 02-21-21, 11:28 PM
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I checked the Bianchi front axle nut carefully at the hardware store. Its 10 mm. The previous owner must have changed the hub. The Mercier has 9 mm front and 10 mm rear. My next question is , who is good supplier of replacement 9mm and 10 mm nuts? Not many SS riders here, it's too hilly. The LBS was stunned.
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Old 02-22-21, 10:24 AM
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Originally Posted by 5 mph
My next question is , who is good supplier of replacement 9mm and 10 mm nuts?
https://www.retro-gression.com/colle...rack-axle-nuts
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Old 02-22-21, 04:27 PM
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Thanks , appreciate it.
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Old 05-03-23, 09:19 AM
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Original owner of a Bianchi Pista here. All chrome, around 2005 (uncertain of model year), and no logos on the front hub. Stumbled across this thread and thought I'd chime in with my findings. My axles are 3/8" x 26tpi (as measured and replaced) 2-piece rotating flange axle nuts. As others have mentioned, 10mm x 1 is really close, but you can check with a gauge if the threads are 26tpi or 1mm. Thread gauges are like $10. I have M9 & M10 x1mm nuts and 3/8" x 26tpi for comparison as well.

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Old 05-04-23, 11:34 AM
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Another original owner of a Bianchi Pista - but mine was a 1999-built as a 2000 model year, back when they were matte black with Celeste decals. Original version came with Suzue Pro Max hubs, which used 10mm axles front and rear, with the front axle slotted to fit a 9 mm aperture. Not sure how long they came stock with those hubs, though.
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