Raising the front mech.

Hi all, Just a quick question for the mechanically savvy among you.
After walking into the teeth of my trike's big ring for the second time I decided to buy a bashguard to protect myself and others.
It fitted on without a problem until I attempted to change onto my big ring - of course the front mech hit the guard as it's 1 size larger than the ring.
I know raising the mech will solve the problem, but will it cause others in it's place????.
I'm running a 52,39,26 triple with an Ultegra 6603 long cage derailleur.

All advice would be much appreciated.

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Permalink Reply by James Jordan on July 11, 2012 at 9:42
You are able to raise the front mech and it will still work but you need to retune.

The biggest potential problem will be stopping the chain from overshooting the chainring.

If you are not comfortable with adjusting derailures I would suggest speaking to your LBS.
Permalink Reply by Terry C on July 11, 2012 at 10:54

Shimano recommend a max of 3 mm clearance over the big ring.  Is it possible to space the guard further out, to give the derailleur more sideways clearance ? 

Permalink Reply by Randall Oakley on July 11, 2012 at 11:10
I tried that, not enough room I'm afraid.
Permalink Reply by Alasdair McLellan on July 17, 2012 at 13:16

Raising the mech WILL cause shift problems. You can totally do it but the gate spacing will then be all whack.

Permalink Reply by Don (Who's lost?) Nairn on July 11, 2012 at 11:03

I would want to look at the issue before giving a diagnosis.

I would imagine most bash guards would be designed for conventional bikes rather than recumbents.

Permalink Reply by Randall Oakley on July 11, 2012 at 11:25
It's in front rather than below, aside from that it's the same.
I'm on holidays this week so I might be able to get to the work shop perhaps.
Permalink Reply by Richard on July 11, 2012 at 11:29

You're right about them being the same Randall. Just move it up a bit and readjust, see how you go.

Permalink Reply by Richard on July 11, 2012 at 11:14

The manufacturers and repair websites all insist on a very close fit between the top of the chainring and the dr, however if you look at how bikes are set up by mechanics, the front dr is often/usually well above this. Soooo, my advice is to raise it and give it a go. If it doesn't work or causes other problems, then have a yarn with a mechanic who is versed in 'old school' ways - I've found some modern mechanics just follow the instructions and leave it at that where I've found others (such as Nathan at Tailwind) are able to fiddle and get things working properly.

Permalink Reply by Randall Oakley on July 16, 2012 at 23:18
Well; I finally ran out of other jobs to do on the trike, so I took the plunge and had a go.
I don't know what I was worried about. Except for the long cable almost having my nose off when I released the clamp, it was a piece of cake.
Now all I need is this blasted cross member to hurry up and get here and all will be good once more.
Permalink Reply by Doddsy on July 17, 2012 at 22:23

http://sheldonbrown.com/gearing/index.html 

Worth looking at this site every time your curious about something bike related. 

Unfortunately Sheldon passed away before he got onto the modern hydraulic and suspension type stuff. 

Permalink Reply by Randall Oakley on July 18, 2012 at 4:17
I've lost track of the times I've read "Sheldon knows all" in forums.
What a fantastic legacy to leave behind.

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