Dish Technology 39D (Type B) Shimano 7900 Dura-Ace:
The Shimano front gear system is based on the HyperDrive concept. The derailleur, the HG chain and the SG-X plates work together to achieve a more reliable, more precise and faster front change action.
Without HyperDrive, problems can frequently occur when changing the medium to large plate, especially under high loads. The Shimano Hyper Drive system avoids that problem. The front teeth, the pins of the SG-X plates, the super rigid wide link diverter and the spatial profiles of the links of the HyperGlide chain have been designed so that they interact perfectly to achieve a smooth and trouble-free change. The plates have exceptional torsional rigidity and the teeth have contoured profiles to ensure that the chain engages smoothly with the plates to raise or lower the gears.
-Hollowglide (hollow technology in the outer plate):
The hollow structure of great rigidity reduces the weight without affecting its strength. Better force transfer and front change faster and more accurate.
Quick OverviewThe influence of the dishes on the performance of the chain change systems is often underestimated. To achieve the original performance, Shimano sets of cranks will only be used together with the appropriate original Shimano plates. Only these plates have been designed with precision engineering for a perfect interrelation between them and the Shimano chain. With features such as profiles of special teeth, ramps and pins, ensure a precise and smooth front change.
Product availability: The majority of our products are in stock in our warehouses, this is stated on the same page as "Product in stock. Delivery within 24 hours". In products with size options, this information will appear when you select the size you want. If we do not have the product in our warehouse, we will inform you of the estimated delivery time. We will keep you updated on this information and work to ensure you receive your order as quickly as possible. When the product is not available we will give you the option to sign up to an alert to let you know when it is back in stock.
Payment method: You can pay by card, paypal or bank transfer. If you choose the last option, you will receive an email with our bank details for you to make the payment. When we have proof of the payment, we will take care of changing the status of your order and start to prepare your items for delivery.
Delivery costs: The majority of our orders come with free delivery. Purchases over 49 euros in Spain have free delivery excluding products such as dumbbells, weights, MTB, BMX, urban, road and electric bikes. We don't deliver to the Canary Islands, Ceuta or Melilla.
Returns: 100% satisfaction guaranteed, with 365 days to return your purchase. You can manage this via the "My Account" section where you can request a return. You'll find all the information you need here.
Size changes: For products with size options, you can consult the size guide table in the product details, to help you choose the one that fits you best. If when you receive the order, you need a different size, you can change it free of charge (Spain). If the new size isn't available we will find you an alternative. Here you will find all the steps to follow.