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A 2 bike cover will be easier to get over your ride, it will definitely go all the way to the ground and it gives you the option of of squeezing another bike in if necessary or throwing something else (toolbox, bike stand, etc) under the cover if you’re caught in the rain. The Pro Bike Tool Cover is also available in three sizes: Large, X-Large and XX-Large, which are all, more or less, the same size as the YardStash covers.
And unless there's a covered area in your outside space, your bike is likely to be exposed to the elements. It’s especially important to use a cover if you store your bike outside. If you live in the city, you’ve likely seen those poor bikes changed outside battling the elements ( and losing.) Even indoors, a cover reduces the possibility of grease and grime showing up on walls and floors. No matter where you need to park your bike, whether it be for a few hours or a few months, it’s a small investment toward the maintenance and care of your favorite ride. A flat disc is generally found in wind-tunnel tests to be worth a saving of about 30-40 seconds over a 25-mile time-trial compared with a standard road wheel. A lenticular disc or a set of wheel-covers can improve a further 5-10 seconds on that, possibly more in a stronger crosswind.Your wheel must have 5mm minimumclearance between the largest cog on your cassette and the drive side spokes. Look out for the stitching used to hold the bike cover together too. You want double stitched and heat treated seams to maximise tear and water resistance. What size do you need? Profiled covers, which fit over a regular spoked wheel to convert it into an aerodynamic disc wheel. All the wind-tunnel tests show that a disc wheel has the lowest drag of all types. Furthermore, as the yaw angle increases (greater relative side-wind), the drag reduces even more and in some cases can become negative - like a sail driving you forwards. For this to happen, the airflow needs to stay attached on the leeward side of the disc. This happens best if the disc is lenticular (lens-shaped) rather than flat, in the same way that an aerofoil works better than a flat aircraft wing.
You don’t have to spend lots of money to get a really good bike cover. But there’s tons of different bike covers available and they’re certainly not all equal. I recommend avoiding the really cheap ones though. They might have all the features of the more expensive covers, but they're made with thinner materials that are just not as durable or weather resistant. How to choose a Bike Cover
Evoc Stage 12L Rucksack
Smaller (1 bike) covers will be a tighter fit. They’re more difficult to get over your bike and sometimes they don’t fall all the way to the floor, leaving gaps that can increase the bike's exposure to the weather. So it’s probably worth thinking about how often you’ll be using the bike that you’re covering. If you're using it every day, you might want a slightly lighter cover than if your bike will be under cover for weeks or even months at a time. But if you get the material (and stitching) right, you'll have a bike cover that will last a decent amount of time, whatever the weather. You'll pay more for better quality material, but not much more, so it's a worthwhile investment. Wheelcovers are available in Classic, Lightweight, Premium and now new Ultra lay-up. The Lightweight and Premium both offer around a 10% weight saving over the Classic, while the Premium also features a distinctive 'spread-tow' chequerboard carbon finish. The Ultra also has the chequerboard finish but boasts a further 10% weight saving over the Lightweight as well as exclusive Gold or Silver graphics. An Ultra wheelcover for a deep-rim wheel can now add less than 200g to the wheel weight. When you race with a disc wheel, you'll need a 90-degree pump adapter to access your valve with a standard pump such as the Silca presta adapter.
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