I bought a montra rock 4.1 in 2018. It rides really well and I clocked around 5k kms. There was incident after 3.5 years where the Derailleur( shimano acera )and hanger broke. I have been trying to buy hanger for past 2 months. Any and every cycle shop I approached said that it's not available. I tried to buy it from TI cycles, the company that came out with montra cycles. The customer care just kept delaying saying different excuses, and eventually stoped answering my calls after 1 month. I realised why the hanger was not available at the retailers. The manufacturer themself had stopped making the part and they were trying to save face. So anyone who is trying to buy montra please be aware of this or make sure to ask them about availability of spare parts. Eventually I bought a custom made hanger from RR cycles(bangalore), which will be delivered soon and I hope it fits.