This is the way the Vespa Grande came from the factory. The front wheel came with a 17" x 2.5" ribbed street tread and the rear came with a 16" x 2.75" universal tread. I have three Grandes in the garage and all have this same configuration with original equipment tires on them. I like the way it affects the handling. The larger front tire with a street tread really seems to help in cornering.