Every October the shop floor divided itself along a line that nobody drew but everybody saw: the bicycles with full-length mudguards and the bicycles without. The mudguard was the least glamorous component the shop sold, and the most diagnostic. It told the mechanic, at a glance, whether the bicycle in the stand was ridden or merely owned.

The stripe up the back

The argument for the mudguard was written on the rider's own coat. A bicycle without guards in wet weather throws a stripe of road water up the rider's back, a dirty exclamation mark that announces itself to the whole office. The shop kept a quiet taxonomy of the stripe: the occasional rider's stripe, light and surprised; the daily commuter's absence of stripe, because the commuter had been told once and had bought the guards. The line ran through the town like a tide mark.

Fitting was the hidden work

The mudguard's unpopularity had a mechanical cause: fitting full-length guards to a frame not designed for them was fiddly, knuckle-scraping work. Stays to be bent, clearances to be checked, bolts in places a hand could barely reach. The workshop charged for the fitting because the fitting was the real product, and the stand did it well enough that the guards stayed silent for years. A rattling mudguard was a badly fitted mudguard, and a badly fitted mudguard was a bad advertisement for both the shop and the idea.

The winter the bins emptied

Every few years the town had a wet autumn and the shop's mudguard shelf emptied in a fortnight. The workshop learned to read the season: order the stock in September, fit the rush in October, watch the stripe disappear from the town's coats by November. The mudguard rush was the workshop's harvest, and the shop that stocked deep through it earned the gratitude of an entire winter of dry backs.

What the guard said about the rider

The full-length guard was a declaration disguised as an accessory. It said the bicycle was transport, not hobby; that the rider rode in weather, not just in light; that the machine was expected to work in November the way it worked in June. The mechanics respected the guarded bicycle the way tailors respect a worn suit: it was a thing in use. The race bike in the stand was a pleasure to fix. The guarded commuter was a duty.

The compromise that failed

Between the full guard and nothing lived the clip-on, the clip-under-the-saddle strip that kept the worst of the stripe off and nothing else. The stand fitted them with a shrug because they were the compromise customers asked for, and the compromise did its small work badly. The stripe crept up anyway, the clip fatigued by spring, and the rider returned in October for the real guards. The shop learned to stock the small compromise and sell the real thing with patience.

The line the shop kept

The mudguard line stays in the notebook because it was the shop's quiet sorting of the town's riders into those who used bicycles and those who had them. Neither was wrong, but they needed different service, different stock, different advice. A good stand knew which side of the line a bicycle stood on before the customer finished the sentence, and the mudguard was usually the tell.