Road bikes are known for having long stems and longer reaches, which puts riders in a simultaneously powerful and aerodynamic position. Gravel bikes have a shorter reach than most road bikes which helps keep the rider’s center of gravity in the middle of the bike as opposed to stretched out over the front wheel. Gravel bikes are designed to be comfortable all day – which we’ll get to more when we talk about riding position – while many also include extra mounts and accessories for mudguards, lights, luggage, and more. Road and CX frames are lighter, but they are also much less comfortable, especially on rides lasting more than a few hours. Gravel bike frames are heavier than most road and CX frames because they are designed to be more comfortable and durable. Some bikes even include vibration absorption elastomers, or a short travel suspension design. These features are designed to absorb vibrations and improve comfort over all-terrain, since gravel bikes are expected to experience punishing conditions on gravel, sand, mud, and pavement. Many gravel bikes feature unique frame tubing that includes curved and flattened sections of material, especially in the rear triangle where they are meant to increase flexibility and comfort. Increasing a bikes wheelbase is going to improve stability off-road (Image credit: Enve) Tubing The slacker head tube angle also reduces the chance of toe overlap, which is an important factor for riders on smaller frames. Thus a slacker head tube angle has similar effects on handling as lengthening the wheelbase – they both improve overall handling, especially on technical terrain and at slow speeds. The head tube angle is the angle between the horizontal plane and a straight line running down the center of the steerer tube – making this angle “slacker” means lengthening the wheelbase and pushing the front wheel further in front of the bottom bracket. This differs from CX bikes and some road bikes which have much shorter wheelbases for quick handling in tight corners. The longer wheelbase helps ‘stretch out’ the frame, which improves handling and stability on rough terrain. One of the defining features of gravel bike geometry is a longer wheelbase and slacker head tube angle. While it will add extra cost, the best option is to consult a qualified bike fitter as they will provide the most comprehensive advice on size and fit. Ultimately if you are unsure on what size of bike to get talk to the shop or test ride a few bikes if possible. Smaller frames will offer better agility and performance however lower front stack height (the height of the top of the head tube in relation to the bottom bracket) may require more compromises to get the right fit. The choice between two different sizes is going to change the ride quality of the bike. If you're between sizes you will need to consider the bike's geometry to determine which size bikes stack and reach numbers will best suit you.
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