SunRaceShimano Compatible Index Hanger Plate with Nut and Bolt

mounted derailleur just fine

I used this hanger in order to upgrade to a far better quality rear derailleur (RD) than what came stock on a cheap department store Mongoose MTB. The original RD had an integral hanger, but did not include a spring tension adjustment (AKA "B-screw"). Its main pivot wore out after only about 25-30 singletrack rides with frequent shifting. Currently I have a Shimano RD-M310 Altus installed in conjunction with the RD hanger of this review. The new RD is shifting the rear gears very nicely now. Hopefully its main pivot is much more robust than what I had before.I was surprised that the pads on the V-brake unit on my rear rim did not have to be repositioned after the installation of this RD, because it occupies at least 1/4" of the slotted hole in a bike frame's rear dropout. This means that if you previously had the rear axle all the way back to the deepest location in the dropouts, you will no longer be able to locate it quite that far back. Consequently, an axle that is further forward than before may necessitate the removal of a chain link and/or the repositioning of rear rim brake pads.My only complaint is that its steel material defeats the purpose of a derailleur hanger. It is supposed to be easily bendable, in order to absorb damage that would otherwise be taken by the RD. This is particularly important when riding on singletrack trails among trees, stumps and embeded rocks. You keep a cheap, disposable RD hanger in your backpack instead of a complete replacement RD.TIP: To avoid an installation headache, here is the most efficient sequence of instructions. Break the chain and completely remove the wheel. Then install this hanger on your frame's right rear dropout slot. The nut goes on the inboard surface of the dropout in such a way that its curved surface goes against the the curvature of the dropout's slot. Then fasten the new RD to the hanger. Finally, thread the chain through and rejoin its ends. Do not join the chain before the new RD is installed, otherwise you will be in for an avoidable frustration wrestling against the RD's spring tension.

So, I'm an avid cyclist. And as such, I have a bin full of spares. Derailleurs, brakes, you name it. I also love crappy department store bikes. Sure they are junk, but with a little help, they can be made into great "townies" where you don't really care if they get scratched or dinged up, and in the event that they get stolen, you are only out $100.Sadly, my most current department store junker only made it about 40 miles before the rear mech decided it had enough of this cruel world and threw itself into the rear wheel. It's short life at an end I was left pushing the bike home not too terribly bothered because I have that box of spares in my garage. However, department store bikes tend to use cheeseball rear derailleurs that don't use a modern standard hanger.This brilliant little device replaces the crap-tastic department store rear derailleur that are integrated with the hanger which allows you put affix a higher quality rear mech. After about ten minutes of fiddling, I was able to install a retired Shimano XTR rear mech to my department store junker. The best part is, this battered XTR derailleur has improved the shift quality of my leaps and bounds.The irony is, when new, that XTR derailleur probably cost double what this entire department store clunker cost when I bought it new last summer.

It work on rear facing horizontal dropout but look/feel awkward as this hanger facing forward. Wish they make them rear facing version.

I have an old hybrid bicycle (built in 1994, I think). I use it on bike trails. I don't want or need anything newer or fancier. But, some of the components on my old bike are wearing out. Case in point: the rear derailer was about done-for. This part allowed me to remove the rear derailer and install a newer one that didn't have a built-in hanger. While there are cheaper, no-name-brand options available here on Amazon and elsewhere, I opted to go for a name I knew in SunRace. This part worked as advertised. It's really more of a 3-star item, in my opinion -- which is not a knock on the item itself. It does what it's supposed to do. But it's just hard to get excited about a 2-inch hunk of steel. I gave it the extra star as it has a name brand embossed in it, as opposed to the generic alternatives.

Shipping companies don't work free..Most of the cost of these is in shipping SO I bought TWO of these. Both for about the same shipping cost as one.. With shipping two cost under 10 bucks or about 5 dollars each. Half of what I paid at another place....If you have a cheap box store bike with the axle mounted cheap rear Derailleur and you want to put a GOOD BOLT on rear derailleur on your bike this is WHAT you WILL need for Shimano and compatiable.It's a CHEAP FIX even with the cost of shipping..I bought the Shimano brand at another place. I got only 1 and paid shipping for a cost of about 10 bucks. TWO of these for that price means these are half price.If you buy TWO the second one is almost free..Keep one on hand. Never know when you will need the other one..I like installing GOOD parts on Cheap bikes and making them better. I bought an old used bike for 30 bucks, but 150 bucks into it and that baby rides smooth as my Trek 400 did...10 bucks ain't gonna break anyone. Yes, Get two of these while you can..

yeah this is the counterpart for the standard hanger for the stock, entry-level derailleur that has the set nut in back that secures inside the slot. what threw me from just pictures is the bolt head, it doesn't go through some hole in the bike. may seem silly to point that out but since the stock photos only show one side of the product i had to go on faith, but yeah this will get the shimano-esque derailleur in the same spot as the old one when repurposing an entry-level frame.