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1939 Bianchi Saetta axle size question

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1939 Bianchi Saetta axle size question

Old 11-18-15, 12:21 AM
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lenos
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1939 Bianchi Saetta axle size question

OK this is pretty esoteric (isn't that part of the beauty?)

I have a 1939 Bianchi Saetta that originally was equipped with a Bianchi stamped Siamt hub and Vittoria Margherita changer. It was "updated" in about 1950 to a Sturmey archer 3 speed hub. Other than that, the brakes and rims, most of the rest of the bike is original.

I have been looking for the correct rear hub for about 3 years and finally found one albeit it is missing the original axle and wingnuts. I know the wingnuts are like unicorn horns, but I figured an axle shouldn't be too difficult. So far I'm stumped.

It appears to me that the both the front and rear axle diameters are the same relatively small size, about 8 mm, but the actual ball bearings in the rear hubs are of a larger diameter.

Does anyone out there have knowledge of these pre-war axle sizes?

Thanks,
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Old 11-18-15, 06:59 AM
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I have several sets, FB and Siamt. I'll measure them tonight.
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Old 11-18-15, 06:18 PM
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Both FB and Siamt are 8.0mm up front and 9.5mm in the back.

And lucky for you, there is a donor rear hub on ebay right now.

Vintage Very RARE Siamtrear Hub Steel Eroica Bici Epoca 20 40s Wheel Revolution | eBay
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Old 11-19-15, 12:41 AM
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Thanks so much. I have a couple or period rear FB hubs and the recently purchased Siamt that all have the 9.5 mm. The problem is that the dropout slots are about the same or just slightly less than the axle diameters (a little uneven). I suppose that the drops could have been tweaked over the years, and could benefit from some careful filing.
The other thing that got me wondering is that the original front wing nut has a step that fits inside the front drop, and if the rear were similarly configured such an arrangement would not work with the existing rear axle diameter and dropout slot size. The most reasonable assumption is that the rear is not configured the same.

Thanks again.
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