Installing solid tires without a tire tool could be quite a challenge and dangerous as the force needed to stretch the tire is great.We strongly recommend the use of a proper mounting tire tool as our M040E. This is our economy solid tire installation tool for 24″ Tires. Even with this tire tool, tires will seem to be small and will need to be stretch a bit in order to fit the rims properly.Solid tires are usually about 2″- 4″ smaller than the rims and the reason is that there has to be some compression while mounted on the rim, otherwise the tires would easily roll off the rims. You may need to put the tires on hot water for a few minutes prior to installation to soften the tire a bit and to stretch them easier. Always be very careful during installation.Also be very careful when using screwdrivers as second tool as they can become lethal projectiles and can also scratch/mark your wheels.