Specialized air tool mtb v.2 hand pump black one sizeThe Air Tool MTB pump is our most dependable and durable big volume frame pump. Its intended to be carried on the bike for use in all off road conditions. Youll find that it features a new inverted design, so it greatly increases air capacity, which reduces pump time by up to two minutes. All aluminum inner and outer chamber for durable performance. Inverted dual chamber design is smaller yet moves 28% more air per stroke when compared to our previous