Park Tool DAG-3 - Derailleur Hanger Alignment Gauge, Black

Strong material easy to use wish I had it earlier great price and a piece of kit

The best hanger tool I’ve owned, easy to use and extremely well made, this derailleur alignment tool just does what it needs to do.

Not cheap but worth it 100%. So much better than the previous model which wouldn't help at all when it came to rotating the gage. Perfect for the job..... Usual Park Tool excellence.

lovely build quality and joy to use. Gone are the frustraing days of trying to sort out my gear indexing ;)

So easy to use and very accurate.

High quality tool which is easy to use. Only slight flaw is there is a tiny bit of play but it is possible to allow for that when carrying out the checks. Packs away quickly with no faffing about which is a bonus.

I wasn't sure about getting this as it's an expensive tool for something that you don't always need to use, but glad I got it as I have a bike that wasn't shifting 100% in 2 of the gears, so I bought (one by one) a new derailleur, new chain, new premium cables, and a new shifter. Turns out the derailleur hanger was off now it's 100%. It's a good tool to keep hold of for future adjustments, fixing other people's bikes and apparently a lot of the new derailleur hangers aren't 100% straight either.

Good quality. Ideal for fixing bent rear derailleur. A must have for a workshop. Recommended.