Originally Posted by
Badger6
The Silca calc is free (I never put my real email in). I've used the SRAM one, I cannot remember why I switched to using the Silca one...I think it was because Silva works off of measured width, rather than what the sidewall says. Either way, a calculator is key. And, as such, a calculation (if it is indeed calculating) is not a guess, but the returned result is definitely a starting point.
I agree. Just have to bear in mind that the calculation is an estimate based on various parameters and assumptions. For example they have to make assumptions about your tyre compound and construction. It's worth checking your tyre manufacturer's pressure guide too, as the better ones have detailed recommendations for their specific tyre variants.