I purchased this bike from Sportcheck online. It was delivered two weeks after placing the order, Ok !
The bike arrived without any tools for assembly, Ok !
I was initially pleased with the bike's appearance and overall finish. During the first week of use, everything seemed to be in order. Unfortunately, in the second week, the chain started skipping frequently, and after just two weeks of use, the bike completely broke down. The incident occurred as I was riding; suddenly, the chain snapped and caused me to lose my balance, resulting in a fall. NOT OK!
I promptly took the bike to the Sportcheck store for servicing. It took them 4 days to rectify the issue. However, I encountered an unsettling response from one of their mechanics. He attempted to attribute the breakdown to my actions, suggesting that my use of the smallest gear only had caused the gear to wear and crack, subsequently breaking the chain. He even advised against using this gear and recommended shifting to other gears to avoid a recurrence. Furthermore, he warned that if the gear were to crack again, they would not provide further repairs. Yet, there are several points that the mechanic seemed to overlook:
Firstly, my bike was only two weeks old and should not have experienced such a rapid breakdown unless a significant underlying issue was present.
Secondly, I frequently shifted gears while riding.
Thirdly, I am a mechanical design engineer with over 15 years of experience in the field. The design of this bike is very weak. Upon my initial observation, I questioned the durability of these small chains and sprockets against the combined forces of human pedaling and motor assistance. The bike's design appears fundamentally flawed, disregarding basic engineering principles of power transmission systems (chains and sprockets).
Lastly, the larger gears (lower speeds) appear impractical, especially in an electric bike with motor assistance. In reality, riders tend to utilize the smallest five gears at most.
I deeply regret my decision to purchase this bike and intend to work with Sportcheck to arrange its return. I strongly advise potential buyers to think twice before buying this bike.