When choosing bike accessories, the options vary depending on the type of bike and the rider's budget. For electric bikes, there are specific guidelines to help buyers select the best models, whether they are looking for affordable options or those with cargo capacity. A helmet is a crucial piece of equipment for cyclists, and the Lumos Matrix is a high-end model that offers advanced safety and customization features. It includes nine foam reinforcements for impact protection and a 77-LED panel that can be adjusted for brightness and color, starting at 249 euros. For those with a smaller budget, the Btwin BOL 500 is available at 40 euros, though it is advised to remove the foam ear protectors to enhance awareness of surrounding sounds. Another option is the R-PUR Nano Light helmet, which includes five layers of filtration to help protect against air pollutants and is priced at 129 euros. When it comes to carrying gear, the Overade Loxi Bag is a secure choice, available in 4-liter and 9-liter sizes. It includes a 12 mm thick anti-theft lock and is priced between 85 and 100 euros. For phone and GPS holders, the Quad Lock system is known for its secure locking mechanism and compatibility with a wide range of cases, priced between 60 and 90 euros. A more affordable alternative is the SP Connect system, available for 50 to 70 euros. A universal holder from Decathlon costs less than 20 euros, making it a budget-friendly option. The Beeline Velo 2 is a small compass that connects to a smartphone, offering navigation features at a price of about 115 euros. Lighting accessories are also important for safety and visibility. The Knog PWR Rider has a 450 lumens output and an integrated 2200 mAh battery, though the exact price is not specified. The Ebuyfire intelligent rear light uses an accelerometer to automatically turn on and adjust light intensity, and it is also priced at an unspecified amount. The Cosmo Ride signaling light, available separately at 5 euros, can be attached to a helmet or bike. For those on a budget, LED light sets with both front and rear lights are available, with the rear light designed to be visible during both day and night. Additional accessories include the Galanck Galuchon Bag, which features customizable LED lighting and costs about 90 euros. The Lixada Yellow Jacket offers LED signals for direction changes at a low cost, while Salzmann 3M Ray Reflectors enhance night visibility at just a few euros per box. The Rockbros Bell is recommended for its strong sound and affordability, while the more expensive Spurcycle bell is considered more solid. For anti-theft devices, the Kryptonite New York FAHGETTABOUDIT is considered the best, featuring an 18 mm steel handle, though it is significantly more expensive. The Kryptonite Evolution Series 4 1090 is a flexible and portable option, while the Abus Bordo Granit X-Plus 6500 is a foldable choice with a high price. The Invoxia Bike Tracker uses the LoRa network for geolocation and costs 149 euros with a 3-year subscription.