Park Tool CNW-2 Chainring Nut Wrench Tool, Silver

Great tool and good value for money

Perfect bit of kit. I tried and failed to use a flat bladed screwdriver and thought I’d better get one of these to attach my loose chain wheel back on! Don’t envisage a lot of use but good to have the right kit for the job. Used it on my Brompton after changing the chain and chain wheel etc

It's ok. Managed to get the two stuck bolts out without too much difficulty, but the tool doesn't really inspire much confidence; it's quite a loose fit and slipped a few times but did the job. That said it's only the second chain ring I've worn out in 10 years so not a job I regularly undertake. Better than a chisel!! After reading other comments I thought I'd qualify my review some more; 1. If you can't get the thing to align properly, just turn the whole nut/bolt assembly until you can get some purchase and stability against the chainset with the tool. You'll have to experiment, but you want the tool to align so that the arm has as much contact with the chainset as possible. You get some purchase with it then. 2. As a previous review stated, use a rag - better than your own flesh. 3. If you're really struggling, try clamping it somehow. It'll work fine for a bike that's been looked after, but if the bolts are really seized, it's only going to help you so far. 4. Still getting nowhere? Use a bit of heat if you can. Hard to do, but an ice cube on the allen key nut with a hot water on the bolt might work (I've managed to do sealed bearings this way!). 5. When tightening back up, clean all surfaces with petrol/diesel. If you get a good contact surface the rubbishy bolts won't spin quite so easily 20,000 miles later!! 6. Most important of all.... Keep your chain in good condition and don't run with a worn one... It'll only wear the chain ring faster, and you'll be back trying to free stuck bolts sooner rather than later!

A tool that didn't think I needed utel I look at my chain ring . Look at your bicycle ring for your tools set??

On my Rockrider est-520 locknuts it slipped but with careful application it worked. I don't know what it's like on other brand locknuts but for me it performs as 3 star out of 5.

You may think you do not need one of these, your chainring bolts tighten up just fine by putting your finger on the back whilst you crank away with the torx and anyway you could always use a screwdriver. There’s no polite way to put this - you’re wrong. One day there’ll be a loose bolt that won’t tighten and keeps coming lose. It in no way impacts your riding but you know it is loose and it’ll drive you mad, you’ll end up taking your drive train apart just to threadlock it. I used to think that, then I got one of these cos I had creaking from swapout dropouts and it allows me to make sure the bolts are nice and tight without popping the wheel off. For such a minor investment you have smugness not usually seen outside of parliament as you know you can nip up your chainring bolts effortlessly.

You can get away with using a flat bit of some other tool but this will make things fractionally easier. The nuts tend to be self-locking so you don't need to a get a particularly strong purchase to tighten things up, you just need to hold it enough to really get a grip on the chainring and this is sufficient for that. Frankly the nut and bolt design that uses a hex key for both sides is superior in every way I can think of and if you have the choice you might want to just buy some replacement chainring bolts for about the same price as this tool. Note that the tool is not symmetrical. One end has narrower and longer 'teeth' than the other.

Weird and cheap looking . . . YES ! And with an even more odd way to hold the spanner (If I dare call it that) The best way I came up with was to place it in the Bolt Slots then force it flat against the Chain Ring, holding it there whilst using a Hex to undo / tighten the screw ! I tried holding it in hand like a spanner but gave up as it cuts into my hands . . . Thus the laying flat against the Chainring method ! Unconventional I know but it works for me !

Gutes und günstiges Werkzeug

Does the job

fungerar som den ska. försökte först utan, men det var betydligt enklare med denna.

Not much to say about this. High quality tool as you can expect from Park Tools. American made. I think I over payed a wee bit for this but whatever. Couple bucks won’t hurt. It arrived fast and should last a lifetime.

Ho costruito vari attrezzi per poter stringere i bulloni posteriori della corona ma con dubbi risultati. Ho acquistato l'apposita chiave della Park Tool ad un prezzo molto convieniente(parliamo della migliore qualità). A questo prezzo(5 euro) è un vero affare per una chiave indispensabile nell'officina di un vero biker. Consigliatissima!P. S.. In alcune guarniture il bullone sporge leggermente dalla ghiera, in questo caso si usa la parte piu grossa e sporgente dell'attrezzo(sono due misure differenti).