Chain catchers?

[Deleted member 23692]

As far as I know the chain catchers were brought out for MTB's as when going over rough ground and moving onto a inside triple front ring you get a lot of chain slap which would maybe carry on through the front mech and cause it to fun over onto the BB even if your stops were set right, I had it happen a few times on rough single track, but never on a road bike..if your stops are set right.....

What you've described there sounds like 'chain devices' - which are used on MTB to reduce a drop chain cause by excessive chain slap on rough terrain. They come in a myriad of shapes and styles to guide the chain on to the chainrin,g and/or increase chain wrap, and/or incorporate a bashguard. This does all three....

Chain catchers are more road bike orientated and help stop the chain over shifting when dropping down to the small ring, although there are are few for MTBs these days

 

[Tojo]

What you've described there sounds like 'chain devices' - which are used on MTB to reduce a drop chain cause by excessive chain slap on rough terrain. They come in a myriad of shapes and styles to guide the chain on to the chainrin,g and/or increase chain wrap, and/or incorporate a bashguard. This does all three....



Chain catchers are more road bike orientated and help stop the chain over shifting when dropping down to the small ring, although there are are few for MTBs these days

I know that, what I was saying was the ones that are NOW used on road bikes were the first generation, we now have the contraption you showed being used on MTB's...I wouldn't put that on a road bike, would you....!.
If you set your stops correctly on a roadie you shouldn't need anything to keep it on the chainset....

 

[ColinJ]

If you set your stops correctly on a roadie you shouldn't need anything to keep it on the chainset....

It is possible that might be true for double chainsets but it definitely isn't for triples!

I had my low endstops as tight as I could have them on all 3 of my triple-equipped bikes but I still dropped chains from time to time. If I adjusted the endstops in any more then I could not change down to the little rings.

Alternatively consider Superstar's usually well priced goodness

Small (36-46t) - http://www.superstarcomponents.com/en/chain-checker-small.htm
or
Large(34-50t or 39-53t) - http://www.superstarcomponents.com/en/chain-checker-large.htm-t)

Oh, those look nice - I might fit a red one to my new CX bike!

 

[Tojo]

Sorry, I was referring to double road chainsets, I forgot to mention that, I stand corrected and I agree with a triple they do have a tendency to drop off on the inside ring due to the delay in take up of the over-run as it occurs at the top of the chain run so there is a another delay as the rear tries to take up.....

 

[Tojo]

Also take a look at this Sram FD it actually comes with one pre fitted on the braze on mount bolt....

https://www.sram.com/sram/road/products/sram-rival-22-yaw-front-derailleur

 

[MissyR]

I ended up going down the better to be safe than sorry road and bought a couple of these!

http://www.leisurelakesbikes.com/p/...ax7wAZ97PhLwJdDK9XPn7_nL-VzmePY5d-RoCp0jw_wcB

 

[simongt]

It's like those bl****y silly plastic discs that most bikes have on the rear wheel behind the cassette; why - ? In the wise words of the late Richard Ballantine, in a PROPERLY ADJUSTED drivetrain, the chain should never come off - !

 

[ColinJ]

In the wise words of the late Richard Ballantine, in a PROPERLY ADJUSTED drivetrain, the chain should never come off - !

So, why do some pro cycling mechanics fit them - don't they know how to adjust the drivetrains of their team bikes?

 

[Tojo]

So, why do some pro cycling mechanics fit them - don't they know how to adjust the drivetrains of their team bikes?

I would say that they would fit them when the riders are in the mountains and are using a big outer and a lot smaller ring on the inside chainring for climbing and then building speed for the descent so it gives the chain a bit of a kick back up onto the lower chain ring without dropping off because of the slack.....theory on my part here, please feel free to correct me if I'm wrong...

 

[PhilDawson8270]

So, why do some pro cycling mechanics fit them - don't they know how to adjust the drivetrains of their team bikes?

They have weight to spare, and a company wanting to sell them to joe public pay them money to fit them

 

[Tojo]

They have weight to spare, and a company wanting to sell them to joe public pay them money to fit them

I like, you're probably on the right track as they have been building bikes that come in under the minimum limit for the pro's so why not add weight and eliminate a problem they may have...

 

[Tom B]

I ended up going down the better to be safe than sorry road and bought a couple of these!

http://www.leisurelakesbikes.com/p/...ax7wAZ97PhLwJdDK9XPn7_nL-VzmePY5d-RoCp0jw_wcB

Would you let me know how you get on with this.. I might get one for the MIL. She's not got much mechanical sympathy and has the odd issue with the chain dropping off the MIL/Granny ring.

 

[MissyR]

Would you let me know how you get on with this.. I might get one for the MIL. She's not got much mechanical sympathy and has the odd issue with the chain dropping off the MIL/Granny ring.

Will do just need to get them on first!