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. 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. Keep Your Bike in Riding Shape: Best Bike Tool Kits ● Best Repair Stands ● Best Bike Pumps The Best Bike Covers You will need to remove your cassette to install the Aero Disc Cover. Cassette removal tools are sold separately.

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. 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. 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.Loosening them makes it much easier to get the cover on and off your bike. And then you have more control over how much you want to tighten them once the cover's in place. Storm Straps? However, even if you only have 1 bike, I would recommend you go with the X-Large as it will be much easier to use. Best Bike Cover for UK Cyclists You don’t have to be delicate with your bike cover. Use a hose to rinse it off if you’ve left it outside, or wipe it down with a damp cloth or rag to clean it inside. 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.

They also help you orientate the cover when your pulling it over your bike. And they’re useful for hanging the cover out (after you’ve washed it for instance). Best Bike Cover for US Cyclists Wheelcovers are available in a number of shapes to suit frames with close-fitting, curved chainstays and seatstays, including specific frames like the Planet-X Stealth, Specialized Transition etc. Although a generous sized cover is good for practical reasons, ideally you want a tight fit around the bottom of your bike cover. 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. Tire Valve Caps Ultra Bling White Diamond Luxury with Crystal Embellishment Universal Round Fit Car SUV Motorcycle Bicycle Bike Full SetVentilation flaps and valves allow air to circulate within the bike cover, which will help reduce condensation and disperse any trapped moisture.

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 The covers might not lie completely flat when they are trimmed extremely small. This applies to very deep profile rims in excess of 80mm. Wiggle Ltd (In Administration). 1000 Lakeside, Suite 310, Third Floor N E Wing, Portsmouth, Hampshire, PO6 3EN, United Kingdom

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.