what is the geometry difference between E gravel bike frames and E road bike frames

E-road bikes are developed to deliver their best performances on smooth asphalt,which have relatively low weights, small tyres and aerodynamic optimisation.Thanks to their smaller tyres, lower weights, faster acceleration and aero-optimised frame profiles, e-road bikes are more responsive, more agile and straight-up faster than e-gravel bikes.

E gravel bike are equipped with wider tires, typically between 35mm-45mm, and have a more upright geometry than road bikes.They are specifically designed to excel where e-road bikes won’t go, e-gravel bikes are perfectly capable riding on paved streets, but really come to life when the terrain turns to gravel or dirt. They are designed to be versatile, robust and to handle rough surfaces while maintaining high levels of comfort.

Tyre Width and Pressure

It shouldn’t surprise you that e-gravel and e-road bikes come equipped with different tyre sizes that function best at different tyre pressures. Road tyres are designed for minimal rolling resistance and while all road bikes used to come with 23-mm-wide tyres, most are now kitted with slightly wider 25- or 28-mm-wide rubber.

To offer better grip on loose and rocky surfaces, e-gravel bikes need tyres with a larger contact patch and a more aggressive tread profile. 40-mm tyres are a great starting point. Wide tyres provide more traction on technical terrain, while thinner versions are more efficient on asphalt.

Another benefit of wider tyres is that their greater volume allows you to run lower tyre pressures. In turn, this means that the tyres do a better job absorbing any bumps or cracks in the road as well as improving puncture resistance. In the past, 23-mm tyres were always run at 8 bar of pressure, but now 28-mm tyres are often only pumped up to 6 bar depending on preference and weight. 40-mm-wide e-gravel tyres are typically run at 3 bar to offer the best mix of rolling-resistance, traction and ground contact.

Brakes

The additional weight and increased power of e-bikes requires stronger brakes. While disc brakes have long been a staple of mountain bikes, they have only recently become a common component of road bikes.

E-gravel bikes come exclusively with disc brakes in order to make room for their wider tyres, but they are also necessary for optimal stopping power and precise modulation. Even when it’s wet, muddy or dusty, disc brakes are designed to deliver the same excellent braking power.

Most of the best quality disc brake systems come from Shimano and SRAM. These brakes offer safety and control on even the steepest and most challenging descents. They even use ergonomic levers that allow you to precisely apply just the right amount of braking power.

E-Gravel bikes frames and E-Road bikes frames Geometry

E-Gravel bikes frames tend to be designed with a more upright body position in mind, with the exception of racing steeds, and therefore measure up with a shorter reach and higher stack than many road bikes. Endurance road bikes also feature a less aggressive position, so there may be some overlap here.

Although it looks similar to a conventional E-road bike,E-gravel bike geometry is designed for more stable handling off-road. That normally means a longer wheelbase and slacker angles for the frame and forks.

Most e gravel bikes have a shorter reach, which helps keep the rider’s centre of gravity upright and over the bottom bracket, as opposed to e road bikes which often have longer reaches and stretched-out, low-slung riding positions.

Long reaches are great for time trialling and aerodynamics, but they are horrible for off-road riding and bike handling. Thus, e gravel bikes tend towards handling over speed, and improve overall comfort with a shorter reach. This is often exaggerated with shorter stems, and wider handlebars help to further increase leverage and control.

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