The Berto charts are a great starting point but important to measure your weight distribution. Also remember that descending, or descending/braking quickly creates situations of heavy front biased weight distribution that should be accounted for.
Also, pump gauges are typically +/-5% gauge accuracy when new and are dying slowly with every inflation. We recommend replacing your gauge every 5 years with moderate use if you are seeking accurate pressures. When we were developing the 303 for Roubaix we found that the 3 Specialized pumps on the Saxo truck had a 12psi variance between them at '70psi' and they were all just a few months old but clearly also got a lot of use. For that particular use case, the difference between using one pump and another was a set of broken wheels in the Arenberg, after that we managed all tire pressures with a $500 0.1% Ashcroft digital bleeder setup we called 'The Truth'
In the new
SuperPista Digital we're using a very high end Wika industrial process pressure sensor and processor that allow us to do a custom curve fit resulting in +/-0.5psi accuracy between 8 and 100psi then drifting to 2% accuracy at 200psi. This sensor is tested to 10,000 inflations with less than 1% accuracy drift.
11-13-2018, 10:15 AM
Linear Mode
