Park Tool DAG-2.2 Derailleur Hanger Alignment Gauge Tool,Blue

One thing to notice is that when it came from Amazon, it was just packaged in a plastic bag and was a tiny bit rusty, but that wiped off with no issues. It works very well and if you're thinking about getting this or the DAG 3, then just get this one, it will do what you need it to do and save you a bunch of money.

This park tool is excellent, well worth the money, it is easy to use and in my case sorted the issue I had with my sram axs shifting problems as my derailleur was not aligned properly from the shop I bought the bike from.

Its a Park Tool so it does what intended. Well made and you know it'll work - but there's a price premium for thatIf I am honest this is a real luxury product for me given the number of times I expect to be using it (despite having more than one bike) but I bought it with some vouchers that were a presentI have used it now and although only small adjustments were needed it did bring the shifting back to where I expected it to beSo - does the job - but at a price

I had a suspicion that my mech hanger was out of alignment, as shifting wasn’t as precise as it once was. After messing around with indexing and limit screws for ages I bit the bullet and decided to get a mech hanger alignment tool.It’s a relatively expensive bit of kit, especially as it hopefully won’t see much use. I Decided to go for the Park Tool product, as opposed to the cheaper Lifeline one sold by CRC, as Park generally have quality, pro standard tools.I was really satisfied with build quality. After reading the instructions and watching the video on Park’s website, I found my hanger was about 6mm out of alignment. A simple process to get it back in shape, and shifting back to normal!Decided to look at my other bikes hanger alignment too, and found that I was able to get the shifting much crisper by tightening up the hangers’ alignment.An essential purchase for any serious home mechanic.

I fitted brand new genuine Shimano Altus brake/shifters (brifters) and an Altus 8 speed derailleur to a second hand 2011 bike. No matter what I tried, the large ring on the front and the 2 largest cogs on the rear cassette caused the chain to come off the lower jockey wheel and jam next to the lower jockey wheel in the derailleur cage. Although there should be cross chaining noise, this jamming should not happen.The derailleur cage did not look anywhere close parallel with the chain line. The derailleur hanger looked straight until I put this tool on it. I found a huge 2.5+ inch difference on opposite horizontal sides of a 700c wheel rim. The vertical was not as bad, but still very unequal. This was very surprising as the hanger looked okay to the eye. I was able to use the Park Tools video on youtube to learn how to correct this. I used two colours of an ohp/cd marker (alcohol marker) for vertical / horizontal instead of the o-rings included. Don’t bend in large amounts, just go back and forth between opposite sides and bend small amounts. I used a strip of double sided velcro on the rear brake lever to hold the wheel still when needed. After a couple of test rides, the problem is now solved !

This is a very simple and handy tool that works and every home mechanic would benefit from. My beef with it is that the quality of the tool is just not near good enough for £60. That kind of money should get you a really nice tool where you can feel the quality and see the attention to detail. Here the weld hasn’t even been cleaned up just chromed over as is. Crappy plastic end caps on the tightening lever is not acceptable at this price.

I re-alligned 3 of the hangers on my road bikes. One was very off caused by the back wheel dropping out of the frame when changing the wheel, which twisted the chain and therefore rear derailleur. Two weren't too bad, but now are very smooth on the shift. Less ticks, clunks and friction on the chain.It's made a big difference to how even the shifting is up and down the cassettes. Before they were either easy on the up and tough on the down or vice-versa, even with the barrel adjuster, limit screws, new cables and re-tensioning.It's easy to use and I'm sure I'll use it a lot every time I give the bike a big service. Recommended.

No doubt this is expensive, but it actually makes doing the job really easy, so on balance I think it’s worth it. My derailleur hanger was badly bent in an accident, but with this tool I got it back into position, and everything works fine again. I uses after you’ve used it twice it will have paid for itself.