Colina Abanicos TitaniumSRAM Red eTap · ENVE · Chris King · Columbus
Trek Madone SLR Gen 6Dura-Ace · ENVE · CeramicSpeed
De Rosa SK PininfarinaDi2 · Deda
Scott Spark CompFSA · Trickstuff
Argon 18 Electron TrackDeda
Ridden, not just built
Built by a rider
Dennis rides what he builds, from the Chilterns lanes to the King’s Trust Palace to Palace, 100 miles in 2026.
Built and serviced
Colina
Moots
Lynskey
Trek
De Rosa
Specialized
Scott
Argon 18
Kona
Cannondale
Cervélo
Rossin
Shimano
SRAM
ENVE
Chris King
Columbus
CeramicSpeed
Independent workshop, not an authorised dealer. Brand names belong to their owners.
Reviews
What riders say about the workshop
Rated 5.0 on Google
Deniss was friendly, answered my Qs, is clearly an avid rider himself, put the chain back onto my bike, and touched up the gears so it was all safe and ready to ride.
Suneel M.October 2026 · Google
Quick, excellent and affordable service and replace - would definitely recommend.
MLAugust 2026 · Google
Great service , really happy with the bikes performance and upgrades . Was a pleasure to deal with . Would highly recommend .
John C.June 2026 · Google
Thank god I found Dennis. Recommended by a friend as i required a handle bar upgrade and some adjustments on my sram red groupset. (Multiple shops had told me that they couldn't help me out or it just seemed sram was too much of a challenge for them. Another shop totally messed my bike up so left me with a broken bike)
I took my bike to Dennis and he reassured me that he will fix all the issues and source a new cockpit. Straight away Dennis sent me some ideas and worked with me to find what best suited my budget.
Dennis completed the work before the estimated time frame and carried out an A1 job. He is a master of his trade and has the knowledge and passion. The icing ontop of the cake was the fair pricing, and ofcourse the end result. My bike has never felt so tuned in and smooth and fast.
Thank you Dennis. A great guy and Highly recommended!
Daniel H.May 2026 · Google
Deniss breathed life back into my much neglected and worn out old bike. It runs beautifully now. He also cleaned it. Can thoroughly recommend his services.
Sue S.March 2026 · Google
Excellent service given adapting to our particular requirements and adjusting the cost appropriately
Yvette C.March 2026 · Google
Dennis has done a fantastic job of two of my bikes. Firstly rescuing my beloved new gravel bike after I damaged the SRAM AXS derailleur hanger - for a very reasonable price.
Secondly bringing my trusty (and very well used) station bike back for a second life with a new chain, cassette, chainring and general overhaul. It’s now an absolute joy to commute on - I don’t think the gears have ever before changed so smoothly. Thank you!
Nick C.November 2025 · Google
Deniss of Custom Bike Service upgraded the Shimano Ultegra Di2 Shift System on my DeRosa SK Pininfarina road bike, he fitted a New Battery, Integrated Junction Box, and a New Bottom Bracket because the original was seized in.
Deniss is friendly and easy to deal with, gives good, professional advice freely, he knows what works and looks right on the bike, and he does great work.
I would definitely recommend Custom Bike Service for work on your bike.
Thankyou Deniss!
Brian Pascoe.
Brian P.October 2025 · Google
I asked Dennis to fix brakes in my electric bike and when I came to collect i was surprised. Not only brakes are like new but the whole bike! He cleaned and greased it, tighten all the bolts, straightened rotors, pump tyres and secured my basket. Very professional, must love what he does. Very quick collection and nice customer service. I will recommend him to my friends as the best one in Watford.
Aleksandra L.September 2025 · Google
A pleasure to deal with someone who knows what they’re doing and looks after the bike like it’s his own.
Only needed a headset regrease, but the bike came back cleaned and lubricated too!
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