That's not a derailleur hanger, it is a fork-mounted derailleur. It gets clamped beneath the axle of the wheel, and the hole behind the slot locates it in the dropout. Taking the derailleur off of the mounting part won't help you attach the normal type of derailleur. If you are replacing that derailleur with a conventional one you can use a generic clamp on hanger.
The pictures are pretty poor, so I really can’t tell if those bikes have track ends or the more normal horizontal dropouts, which could potentially use an adapter like this.
They sell adapters, and you might be able to find one in chrome. I'd keep the Huret though, personally, it was an iconic product simply because of how many were sold. Despite having the shittiest geometry I've ever seen (it literally swings further away from the cogs as it moves to the smaller ones), it shifts well due to its rigidity.
If you start getting interested in replacing any of the rear gear, may I suggest these hanger adapters, which work well and allow the use of regular rear derailleurs:
I believe you are looking for something like this: https://www.amazon.com/SunRace-Shimano-Compatible-Index-Hanger/dp/B001PT8M8C. Can be found by googling SunRace claw hanger. Have you checked at a normal bike shop? I know we have a box of them hanging around.
Oh, super easy then! One of these for your rear derailleur, any will do. For front derailleur get one with a "band" that's sized for the diameter of your seat tube.
And then for shifters/brifters, check if your LBS has anything for 2x7. If they don't, look into non-indexed friction downtub shifters, and some plain old ergo, aero brake levers. Then you'll be fully geared again!
If you run friction shifters you'd have an easy enough time running a triple and then you can run 5 speeds in the back and get way more useful gear range than any 1x setup. Super cheap to find old triples at any bike kitchen/co-op type place. Even nice ones with removable rings in 110/74 bcd are super common from late 80s and early 90s MTBs.
Rivendell sells friction bar end shifters pretty cheap and you have the flexibility to upgrade the rear wheel to 8 speed in the future if you find a deal on a used one off an old hybrid or something.
I'd recommend buying a new derailleur claw like that one so you start off with something straight. Consider keeping a spare around if you park your bike in a crowded rack, they are cheap enough.
This could get done for 100-200 depending on what the used parts market is like where you live. The new bar-end shifters would be the most expensive thing unless you opt for a new rear wheel too.
Is it possible to convert an old track frame to accept a rear derailleur by bolting this into the rear dropout? Are there any issues with doing this to run gears on a track frame?
Technically these are Tourney TZ series RD's, but Shimano just dumps a bunch of completely different RD's in the Tourney groupset: https://bike.shimano.com/en-EU/product/component/tourney/RD-TZ31-A-GS.html
It's basically the cheapest derailleur Shimano makes, and believe it or not 3x6/7 is still pretty common on big box bikes. There are even some 1x6's out there on hybrids.
Agree with you, a modern 9 speed RD is the way to go if OP wants adjustability and a derailleur that isn't going to fold in half. The biggest obstacle to that is the claw hanger, so op would need one of the claw adapters to use a modern RD: https://www.amazon.com/SunRace-Shimano-Compatible-Index-Hanger/dp/B001PT8M8C
Not actually a joke, these 6 speed TZ's are swiss cheese and they can just fold in half if they aren't treated carefully.
Cool, you can also get one of these and put on any derailleur you like.
https://www.amazon.com/SunRace-Shimano-Compatible-Index-Hanger/dp/B001PT8M8C
That's what I did for a Raleigh Grand Prix mixte for my wife. They are sweet rides and the graphics are classic.
It will be 126mm. You would be able to wedge a 130mm wheel in there, but that does not always mean it will work properly. It looks like you also don't have a proper derailleur hanger, so you would need to have a claw derailleur on there, or find a derailleur hanger that would mount on that frame.
https://www.amazon.com/SunRace-Shimano-Compatible-Index-Hanger/dp/B001PT8M8C
You just need a universal hanger. The sun race universal (may also be called the sp500 (previous name).
Example: https://www.amazon.com/SunRace-Shimano-Compatible-Index-Hanger/dp/B001PT8M8C
SunRace Shimano Compatible Index Hanger Plate with Nut and Bolt https://www.amazon.com/dp/B001PT8M8C/ref=cm_sw_r_cp_apan_i_DYYFD0TFEB4N4P8JXMWV?_encoding=UTF8&psc=1
This "claw" derailleur hanger will work for that frame:
https://www.amazon.com/SunRace-Shimano-Compatible-Index-Hanger/dp/B001PT8M8C/
Item | Current | Lowest | Reviews |
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SunRace Shimano Compatible Index Hanger Plate wit… | - | - | 4.5/5.0 |
^Item Info | Bot Info | Trigger
You’re probably better off to just replace the whole derailleur hanger adapter. It’s about the same cost as buying just the bolt:
https://www.amazon.com/dp/B001PT8M8C/ref=cm_sw_r_cp_api_glt_fabc_XGKM5NYC1JWB92Q9W2CX
Thank you for the fast replies. I’m ordering this.
This Hangar is what you need and then you can use a regular derailleur with it like the one you pictured. I have to use this part as well.
The direct mount derailleur won't fit, what this bike currently has is a claw-derailleur. You need the "SunRace SP550" to get compatibility with standard mount derailleurs (not direct mount wich is a newer thing you won't find in a gear range compatible with this bike).
I would check wich BB threading is on that bike before picking out a crank set but this bikes BB is most likely BSA threaded, so lots of options. I'd stay away from the chinesium looking cranks you've found though, even for light use. (Bought a chinesium folding bike once... It folded all right, problem was it did so at the welds while in use...)
Also with a freewheel you don't get a lot of gear range, so I would stick to a tripple chain ring crank set.
You might want to check if this bike even still fits her size as well, this will probably lead to some adjustments to stem, seat post and handle bar. Especially if it's meant to become a more comfortable cruiser-ish bike.
In an extreme case you might have to install a really long seat post and a BMX handlebar.
Shimano touring V-brakes are very nice considering the price (20€ to 25€ should be similar in USD) and are also available in silver to keep the current color coordination.
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You also forgot to list new cables and cable housings.
Are the shifters still working ok? Might have to flush or replace them too.
How about pedals? The old ones could still be good, could do with a re-grease though.
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I'm using a Procraft quill stem to a-head adapter, it's working fine on my parts bin commuter. I don't know if that brand is available in the US though.
Oh, an adhesive might work. Maybe a good epoxy? The issue with the rear derailleur hanger is that there wasn't one integrated into the frame, so I had to get an adapter for a Shimano derailleur, like this one, which uses a small backing plate inside the dropout.
To start with, the small bolt was hitting the cassette, which I solved with a shorter bolt. The second issue was whether or not the chain was going to clear the backing plate. It came extremely close to not working, and is still a little too close for comfort. Maybe once I get some proper lube on the chain I can rest a bit easy but it seems like there may be times where the chain will rub the backing plate.
EDIT: I've done a bit more googling, and it looks like I could eliminate the downtube bracket entirely if I also get a clamp-on chainstay cable stop. This is likely the route I'll go if I keep the frame. There may be a better solution for the rear derailleur hanger as well.