I found that dropouts are needed for derailleur setup & fork space>120mm...can I install any hanger or weld a dropout to the frame?...and also the fork end gap was around 105mm in wheel fitted condition.Can I equip 5 or 6 speed gear set in my mtb? if yes can I also mount disc brake?rear fork end of dirtrider

rear hubrear fork enddirtrider 26" frame

  • The derailleur setup would probably cost more than your current bike... I advice to at least consider to sell this bike a buy another one, more suitable to your need. Commented May 26, 2018 at 6:46
  • Hercules is an Indian BSO brand. Its not worth spending a lot of money on a BSO bike. The frame does not have a caliper mount point and trying to add one is pain. Your wheel's hub is not disk ready so won't hold a rotor. Honestly, it would be cheaper to buy a better bike and use this one for shopping.
    – Criggie
    Commented May 26, 2018 at 8:20
  • The moment you say "weld" you're getting into some pretty complicated and expensive territory. Commented May 26, 2018 at 11:40

1 Answer 1


The derailer is sort of the easy part. Your frame could take a claw style derailer like this:


Or you get one of these and have a lot more options:


120mm is the minimum rear spacing for derailer multi-speed rear hubs, so you would probably need to spread (bend) the frame.

You'll also need a new rear wheel, chain, and freewheel. Your cranks will probably not give workable chainline with a multispeed freewheel as they are now, which usually means toying with the BB spindle length, which is a pain on cottered cranks, and would probably also have you either removing the chain guard or finding a way of spacing it out.

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