Sigma Sports has slashed the price of a host of cycling products, with some serious savings to be had across bikes, components and kit.Now you can save 10% more on what Sigma describes as 'soft goods' in the brand's Warehouse Sale with the code BIKERADAREXTRA10. However, bear in mind this doesn't cover all items on the general sale page.We've trawled through the sale to pick out five of the best deals, including Shimano's flagship road groupset and a carbon Trek Domane for less than 2,000.There are also big discounts to be had if you're looking to upgrade your gravel bike or treat your feet to some fancy shoes.Here are our top picks, but you can see the whole sale here and the Warehouse Sale here. Castelli Ultra Rain Jacket now from 111 Shimano Dura-Ace R9270 Di2 groupset for 1,899 Scope S4 Carbon Road Disc Wheelset for 611 ENVE Road Stem from 89 Trek Domane SL 5 Gen 4 105 for 1,899 Shimano GRX 825 12-Speed Di2 Groupset Bundle for 1,399 Sidi Shot 2S road shoes from 114Castelli Ultra Rain Jacket 240 111 (save 54%) Castelli Ultra Rain Jacket. Sigma Sports With the British weather becoming increasingly unpredictable, a decent waterproof jacket is an essential piece of cycling kit, and Sigma Sports has slashed the price of Castelli's Ultra Rain Jacket.Usually priced at 240, the premium waterproof is currently available for only 111, dropping to 99.90 when you apply the additional 10% discount code BIKERADAREXTRA10.The jacket uses a two-layer Polartec stretch fabric, designed to keep the rain out while offering a close-fitting cut that won't flap around in the wind.Fully taped seams and a waterproof zip help keep the elements at bay, while an extended rear hem provides extra protection against road spray.It also packs into its own internal pocket, making it a practical option to carry on rides when the forecast looks questionable.At less than half its original price, this is a cracking deal on a premium waterproof. Buy Castelli Ultra Rain Jacket now from 104.40Shimano Dura-Ace R9270 Di2 groupset 3,579 1,899 (Save 47%) Dura-Ace is Shimano's flagship road groupset. Simon von Bromley / Our Media Getting Shimano's flagship road groupset for less than 2,000 certainly caught our attention.Sigma Sports has knocked 1,680 off its Dura-Ace R9270 Di2 groupset, bringing the price down from 3,579 to 1,899.Dura-Ace R9200 represented a major overhaul when it arrived, moving Shimano's top-tier road groupset to 12-speed and introducing semi-wireless shifting.The groupset uses wireless shifters, while the derailleurs remain wired to the central battery.It also features Shimano's Servo Wave braking technology and redesigned calipers with increased pad clearance.Despite rumours of a new generation being released soon, at 47 per cent off, this could be a tempting opportunity if you're planning a dream-bike build or looking to give an existing road bike a serious upgrade.This deal is for groupsets specced with 160, 170 and 172.5mm cranks, but there are still savings to be had on the 175mm variant, too. Buy Shimano Dura-Ace R9270 Di2 groupset now for 1,899Scope S4 Carbon Road Disc Wheelset 900 611 (save 32%) This is a great deal if you're looking to upgrade your wheels. Sigma Sports If you're looking to give your road bike a serious performance upgrade without spending four figures, Sigma Sports has knocked 289 off the Scope S4 Carbon Road Disc Wheelset.Usually priced at 900, the Dutch brand's carbon wheels are now available for only 611, making them a tempting option for anyone looking to ditch their stock aluminium hoops.Featuring 45mm-deep carbon rims, the S4s aim to strike a balance between aerodynamic efficiency and low weight, making them suitable for everything from fast club rides to racing.The wheels are also tubeless-ready, enabling you to run lower tyre pressures for improved comfort and grip.At just over 600 for a complete carbon wheelset, this is a particularly appealing deal for riders looking to upgrade without breaking the bank.Only the SRAM XDR variant is available in this deal. Buy the Scope S4 Carbon Road Disc Wheelset now for 611ENVE Road Stem 330 89 (save 73%) This stem would add bling to any bike. Sigma Sports If you're looking to add a touch of premium carbon bling to your road bike, Sigma Sports has slashed the price of ENVE's Road Stem by as much as 73%.Usually priced at a rather eye-watering 330, the American brand's carbon stem is now available from only 89, making it a tempting upgrade for anyone looking to finish off a dream build.Constructed from unidirectional carbon fibre, the stem features titanium hardware and a cold-forged aluminium faceplate, helping to keep weight down while maintaining stiffness.It also features a reversible six-degree angle and a standard 31.8mm handlebar clamp, with lengths ranging from 80mm to 140mm.The 89 price only applies to the 130mm and 140mm lengths, although there are still savings on other sizes. Buy the ENVE Road Stem now for 89Trek Domane SL 5 Gen 4 105 2,800 1,899 (save 32%) This looks a great deal for those wanting a carbon bike. Sigma Sports You can pick up a carbon Trek Domane for 1,899, saving 32 per cent.The Domane SL is built around Trek's 500 Series OCLV carbon frame and is designed to balance speed with comfort over longer rides.The Gen 4 bike uses Trek's rear IsoSpeed system, which is designed to add compliance at the seat tube, while generous tyre clearance gives the Domane some versatility away from pristine tarmac.The SL 5 is equipped with Shimano's mechanical 105 groupset and hydraulic disc brakes.With a 32 per cent saving, this looks to be one of the standout complete-bike deals in the sale.Only the 54cm size appears to be available at the time of writing, but if the shoe fits, this could be a great time to upgrade your road bike or get a dedicated winter training bike. Buy the Trek Domane SL 5 Gen 4 105 now for 1,899Shimano GRX 825 12-Speed Di2 Groupset Bundle 2,060 1,399 (save 32%) This could be a great upgrade for your gravel bike. Sigma Sports Roadies aren't the only ones getting a hefty Shimano discount.The latest 12-speed GRX RX825 Di2 groupset has dropped to 1,399.GRX RX825 brought Shimano's electronic gravel groupset in line with its latest road offerings, using wireless shifters alongside a wired rear derailleur and battery.The shifters also feature additional buttons on the hoods, which can be configured to control compatible bike computers or used as extra shift buttons.If you've been considering moving your gravel bike to electronic shifting, a 32 per cent discount makes this considerably easier to justify.This specific discount is for the 172.5mm variation. Buy Shimano GRX 825 12-Speed Di2 Groupset Bundle now for 1,399Sidi Shot 2S road shoes 425 114 (save 73%) Another true bargain. Sigma Sports You don't have to spend four figures to take advantage of one of the biggest discounts in the sale.Sidi's Shot 2S road shoes have fallen from 425 to 114, depending on size and colour a hefty saving of up to 73%. Plus you can get another 10% off using BikeRadar's special code, which brings the price down to 102.60.The Shot 2S sits towards the top end of Sidi's road shoe range and features the Italian brand's carbon sole and centrally mounted Tecno-3 closure system.There's also an adjustable heel-retention system, designed to help secure the rear of your foot inside the shoe.A 425 pair of shoes is undeniably extravagant, but at this price they become a much more interesting proposition how are they making money here?This price is for the Anthracite colourway, with sizes 40 to 48 available at the time of writing, although prices increase to 125 for select sizes.There are also good savings to be had on the other colourways. Buy the Sidi Shot 2S road shoes now from 114