Bike on bike nut job

February 8, 2017 at 20:58 | Posted in bicycles | 1 Comment
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It bikeonbikesometimes happens that I end up with two bikes at work. Some inequality in rides too and from caused by side trips, lifts, taxis and business trips conspire to create this imbalance. For the most part I just wait it out, and it usually corrects itself, but the situation had been going on for weeks, and didn’t seem to be resolving.

So I went with the rather unwieldy option of strapping the fixie to the Radish. This requires removing the wheels, strapping the frame down via the chain stays, and putting the wheels into the panniers. On this occasion I also had rather a lot of other things to carry, so I had to tuck both wheels into the same pannier, which was not 100% straightforward. Still, I managed, and arrived home without mishap.

Or so I thought. When I can to reassemble the fixie, I realised that one of the wheel nuts had gone missing from the front wheel. Damn lawyers. Evidently I had left the nut rather unscrewed, and it had worked loose and dropped off.

I effected a temporary fix by ‘borrowing’ one of the nuts from one of the little Chillikebab’s bikes (sadly she doesn’t ride it much; she’s more a dedicated scooter girl), and then set about ordering a new nut.

Now, this is when it got unbelievably complicated. Apparently no-one knows what size regular bike wheel nuts are. Attempting to google it yields hundreds of threads in hundreds of bike forums with people asking this exact question, and then receiving as many answers as there are types of nut – both literally and figuratively. I was literally unable to find this out. Hub manufactures don’t put in in the specs. Bike shops don’t tell you (and don’t stock them). Even my LBS was unable to help, trying a few nuts out halfheartedly (none of them fit), and then saying they would have to ‘look into it’.¬†Apparently it could be an M10. Or a 3/8″. It might have 24 or 26 threads per inch, or perhaps a pitch of 1.25, or maybe 1.5. ¬†Probably not 1.0, except on some bikes. The front and back hubs might be different. Unless they are the same. And BMX and coaster brakes have different nuts. Sometimes. Or perhaps not. It might be 14mm. Or 15mm. Or M9. Or M9.5.

Usually, answers go through a range of options for what it could be, and airily finish with ‘they are all standard, so you’ll have no problem getting one”. Ha! I tried every nut available in Bunnings, and not one of them fit.

Finally, I found the answer. Thank you, Moruya Bicycles. Both for having the information, and selling the damn things. ¬† 3/8″ with 26 threads per inch. Outside dimensions 15mm. (Which seems weird to me; a non-metric nut that fits a metric spanner).

Apparently coaster brakes are slightly different, as they had 24 threads per inch. Except little Chillikebab’s bike has a coaster brake, and the nut fits my hub perfectly. I’ve ordered one of each size, to be sure. Now I’m just praying that when they arrive, one of them will fit…

Ginger Nut (NSW)

May 15, 2011 at 13:05 | Posted in biscuits | 15 Comments
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Well, here it is. The review that many have been waiting for – the legendary New South Wales Ginger Nut.

New South Wales? That’s right. Arnott’s actually bake four different varieties of Ginger Nut that are available in different states. This is because Arnott’s used to have bakeries all over the place, and each bakery produced a slightly different product. Arnott’s subsequently consolidated all its manufacturing into one plant in NSW, and hence started shipping the NSW Ginger Nut all across Australia. The result?

Uproar. Outside of NSW people took to the streets with placards, there was looting, civil unrest – for a while it really did look as if the veneer of civilisation was slipping away from Australian society. Australians were simply not happy that someone could mess with their ginger nut. The Governor-General intervened and called for a truce, and Arnott’s agreed to continue to bake the different varieties that people were used to. And so, to this day, Arnott’s bake four different versions of the Ginger Nut and ship them to different states according to local tastes.

In a future review we shall return to this theme, and do a comparison of each of the different types. However, this review focuses on the NSW variety; and in so doing perhaps gives an inkling as to why there was such consternation when the NSW Ginger Nut hit the shelves and palates of people unused to them.

On the surface, the biscuit looks fairly ordinary; quite thin and round. It smells appropriately gingery, and all looks fairly normal.

However, when you come to take a bite, you laugh. You see, someone has switched your packet of biscuits with a joke pack, and in fact these are fake ones made of wood. You put them down, still chortling, and check carefully; ask around as to who the trickster was and so on.

Then realisation dawns. These are no joke. Gingerly you try taking another bite; you hold the biscuit between your teeth and pull down in an attempt to break off a mouthful. Amazingly, despite gripping with the full extent of your jaw muscles and heaving with all your might, you are unable to get the NSW Ginger Nut to yield. You take if from your mouth and it looks completely unharmed, without so much as a scratch or an indentation from your teeth.

They really are quite extraordinary. Being of a sometimes scientific bent, your intrepid correspondent has put the NSW Ginger Nut to the test to discover just what the Ultimate Tensile Strength of Ginger Nut material is. This is done with the Three Point Flexural test. Unfortunately the the industrial flexural test rig I keep in the garage for just such occasions wasn’t working on this day, so instead I had to improvise using cocktail sticks and some heavy weights.

I rested the NSW Ginger Nut on a cocktail stick, and held it down on one side, like a see-saw with only one person on it. I then piled weights on the other side, starting with a heavy board and then adding more weight on top. By keeping the first side down, I was able to measure how much force had to be applied before the biscuit suffered brittle ultimate failure.

Amazingly, the biscuit was able to withstand forces of over 50 Newtons (represented by over 5kg of weights piled on the top). This is I think a testament to the bakers at Arnott’s; clearly this is a material that has few manufacturing flaws.

These data can then be used to calculate the strength of the material; it is given by this formula:

where x is the strength, k the cross-section area, e the force applied and lambda the coefficient of gingeryness.

The test shows that the NSW Ginger Nut has a strength of 34 MPa; below is a table comparing this to other common materials:

As you can see, this places the NSW Ginger Nut ahead of both glass and concrete, but still less strong than wood – so it seems the comparison to a wooden disc is an unfair one. Still, with a greater strength than both glass and concrete it does occur to me that rather than building skyscrapers in the conventional way, Arnott’s could simply bake them instead. Much more environmentally friendly, and who wouldn’t enjoy working in an office imbued with a lovely gingery aroma?

I do like the NSW Ginger Nut. It is a unique product that requires a sort of karate-like skill to bite into. It also dunks beautifully; there is very little danger of getting crumbs in your tea with the NSW Ginger Nut as it can withstand the hot tea almost indefinitely without affecting its structural integrity. Indeed, many people contend that this is the only way to truly enjoy them; the hot tea softening the biscuit and enhancing the flavour ‘not unlike a fine red which releases its best when decanted’ (as one of my correspondents put it). I’m going to give these an eight out of ten, plus a bonus point for being so marvellously uncompromising. No wonder the non-NSW residents of Australia rebelled when faced with such a tough opponent!

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