Honest, Humble and an absolute technician. He glued my tubulars so perfect people think they are clinchers! If there were 6 stars Id give it. 👏

I do essentially all of my own bike maintenance, but when the job is too big or my life too busy, Zach is the only person I trust my bike with.Hes fast, knowledgeable, and detail oriented. I cant think of a better mechanic to work on your daily commuter or your World-tour race machine.

The best. Extremely kind and skilled.

Professional, Prompt, and a customer service experience second to none. Zach is a pleasure to work with and I highly recommend him for high quality, detail oriented work.

Excellent service. The best mechanic in Boulder.

Best bike mechanic in Boulder, or best bike mechanic in the world!? Zach recently helped me build my dream bike and his work was flawless. Incredible attention to detail. He asked the right questions to make sure everything matched my preferences.

Without question, the best shop in Boulder. I got tired of waiting weeks for bigger shops to service my bike, especially when I learned that junior mechanics were working on my bike. Zach is best in the business, fast, responsive, courteous--and I love knowing whos working on my bike. 10/10 recommend.

Zach is the most detail oriented bike mechanic Ive ever met. Hes done quite a bit of work for me including a full custom bike build from the frame up. He also fixed some issues that I was having on a different bike even though I had multiple other shops fix it. For anything outside my home-mechanic abilities, Ill be going back. Super impressed with the work he has done on my bikes. His work speaks for itself, clearly he is an incredibly experienced pro-mechanic and is well-versed in all the latest cycling tech. 10/10 recommend.

Fantastic experiences having Zach working on my bikes. He quickly diagnoses what is wrong, fixes it right and fixes it fast - and all for a very fair price and with a clear explanation of what was going on. I will continue to bring my bikes to Zach with confidence that hell fix them or nobody can.

Top notch high end bike mechanic. Experienced, very friendly and reasonably priced. Highly recommend

Very good service. Quick work.

Zach and Boulder Grupetto are top notch. Zach is an experience pro mechanic and it shows in his work, attention to detail and care. Timely and good listener add up to great service. We have multiple race and rec bikes worked on by Zach and they are always dialed when hes done with them!

Easily the best mechanic in Boulder. Very professional and I know my ride will always be perfect when I have Boulder Grupetto work on my bike.

Passive agressive mechanics

Always hard to find a really good mechanic, who just get everything right the first time, so I was super glad to find Zach at Grupetto. Definitely one of the top mechanics in Boulder.

Zach is fantastic and trustworthy. Only place I take my bike.

Zach is the most attentive and professional mechanic in Boulder. His attention to detail is unparalleled. Dont trust your bike to anyone else.

I took my bike to Zach with a bottom bracket issue. Not only did he do a thorough same-day inspection, but told me there was no charge. I will definitely be using Zach for all my future repair needs, and will be telling all my riding buddies to do the same! It’s hard to stand out in Boulder with so many bike shops, but Zach does it!

Best in Boulder, hands down. No reason whatsoever to use any other bicycle mechanic in Boulder. No attitude. Timely. Fairly priced. Top notch service and knowledge.

Zach is incredibly detailed and thorough with his work and I trust him to work on any of my bikes, from TT to MTB. He is unpretentious and welcoming and has a great workspace. I trust his work completely!

Best bike mechanic in Boulder. Great suggestions, impeccable craftsmanship, fantastic guy.

I have a complete workshop and love to work on my own bikes, but there is one person on earth I trust completely due to his skill and insane level of detail on building and maintaining bikes: Zach. Thanks for the amazing service!

I have not found a better mechanic then Zack. He is detailed, knowledgeable, friendly and delivers my bike to me in short amount of time. He can work on any type of bike and help with difficult mechanical issues.

When I had to replace a bottom bracket and lacked the tools to do so myself, several local pros suggested Zach. He did extensive work on my bike in the spring of 2017 and his work was meticulous and professional. I have relied on him a couple times since then and I am happy to recommend him.

Bike always comes back spotless, and working better than when I built it up (5 years ago). Bike shifts so well after getting it back from Zach, it feels like my mechanical gruppo is electronic. Hes the most professional, friendly, down-to-earth mechanic around – cant recommend him enough. Whether you have a road, tri, mountain, or cruiser bike, he will take care of you...and then some.

Always amazing service, bike rides like a dream.. won’t take it anywhere else, superb knowledge, service and detail to attention...

Always top notch service from Zach! Even when riding for a local shop team I’d bring my stuff to Zach, he’s the best in town.

Best bike repair in Boulder full stop!

Zach is the best, trust him with anything, and the bike always comes back clean!

Best bike mechanic in Boulder

People who think they’re pro go to BCS. People who are actually pro go here. You should go here.

Zach is the best