Скачать с ютуб How to add another gear to your 2 speed Brompton (derailleur 3 speed conversion) в хорошем качестве

How to add another gear to your 2 speed Brompton (derailleur 3 speed conversion)

Do you want another gear on your bike? This is a relatively easy way to give your bike more gear range with almost no weight penalty and it keeps most of the stock parts. I have run this on my personal bike for most of the winter and I have had no issues. FAQ When researching the conversion I came across a lot of questions so hopefully, I can answer them here. Q: What shifter can you use. A: any friction shifter will work, if you want to use an indexed one you need something with the positions. The front derailleur shifter for MTB`s will work and a lot of people use 3 position suspension lockouts. I have used an indexed shifter but the friction is more reliable for me. Q: Can I add more than three speeds? maybe by using 12-speed cassette parts and chain. A: You can certainly use 12-speed cogs but you probably will not be able to fit 4 cogs on the freehub without some serious modification. I have never tried so if it's possible let m know. Q: Is it a hard conversion? A: It's not extremely difficult but you do need some bike maintenance skills and knowledge. If you are comfortable changing chains, cables and sprockets you can probably do this. Q: Will this void my warranty? A: Probably. Q: Does this add weight? A: I haven't weighed a bike before and after but I do not think it would add much if any. The chain and sprockets will both be lighter but there is an extra sprocket so it probably cancels out. It probably depends on the shifter you go with. Q: What cassette and chain do I need? A: I used Shimano 105 11 speed parts but any 11-speed chain or cassette should work. You could also use a 12-speed chain if you are feeling rich. Q: What is the biggest sprocket I can fit on the bike? A: Probably 18 tooth but it depends on the bike. Some frames will fit 19 teeth, some will not fit 17t. Titanium frames max out at 16t most of the time. You could file or cut the corner of the chainstay to add a little clearance. Lots of people have done that and it is not really a structural part of the frame but it can be a little nerve-racking. Q: How much does this cost? A: It really depends on what chain, cassette, and shifter you go with. If you buy all the parts I used at full price it would cost about $270AUD ($50 for the chain, $120 for the cassette, about $100 for the shifter and mount, maybe $30 for cable, housing and noodle). If you keep an eye out for sale items and maybe buy second hand you could save a fair amount off of that price. If you use Dura Ace chains and cassettes along with a dropper remote you might end up spending over $400AUD. If you have any other questions let me know, I'll update this with anything extra as I get it. I made this purely to help answer some questions I have found and some I had myself, it is by no means every answer to every issue you could run into. If you do try this and it breaks your bike please do not blame me. Cheers everyone, happy riding and stay safe.