A neighbor almost had a flat tire with 12 pounds of air! It took about 5 or 6 minutes to inflate the tire to 34psi. Inexpensive but gets the job done. Although I've used it a few times to keep my car's tires properly inflated. This is a simple splint/pump. Ideal for emergencies. Not an everyday workhorse, but not a disposable device either. Therefore, keep it in the trunk for safety. I trust him to do this job.