No Ruddy Idea But Here Goes.

[Serge]

I'm still going!

I thought I may as well fit the brakes. The powder coating has played havoc with some of the threads though, one was tighter than (censored for family viewing).

I think I've had my fill for today, a quick gin then bed may be in order. If you can all get your heads together overnight to solve this derailleur problem it would be much appreciated.

Goodnight fellow fettlers.

 

[Milkfloat]

What size do you need? They have a variety https://www.sjscycles.co.uk/gear-spares/shimano-claris-fdr2000-clamp-band-adapter-286mm-y2b198010/

 

[Serge]

Not quite in bed yet, I thought I'd just take a final piccy of today's progress:

Not a bad afternoon's work if I do say so myself.

Thanks for watching and now the news from where you are.

 

[Serge]

What size do you need? They have a variety https://www.sjscycles.co.uk/gear-spares/shimano-claris-fdr2000-clamp-band-adapter-286mm-y2b198010/

They actually make the buggers! I can't be the only daft idiot who's done this before then.

Thanks for the link, that's great.

 

[SkipdiverJohn]

Chain fitting is easy so long as you are careful not to accidentally push the rivet right through the outer link plate when you split it. I just leave the chain on the BB not on the chainrings so there is no tension on it. Shortening them then getting them to go back together afterwards is more fun & games though.

 

[Pat "5mph"]

Now tell me how you're meant to do it.

Without putting the chain through the back derailleur, drape it over the big ring on the front and the big sprocket on the back.
Put your finger where the chain meets, add 2 links if joining with a pin, cut.
Or, even better, add one link, cut, then join with a quick link.
Take chain off, put it back on, anytime you like with a quick link.
Here's a video.

 

[User6179]

three most common sizes are 28.6mm , 32mm and 35mm
wrap a strip of paper round the tube , measure the length and times it by 3.14 to give the diameter you need

(shamelessly pinched from elsewhere on interwebby thing)

Divided

 

[HobbesOnTour]

If you can all get your heads together overnight to solve this derailleur problem it would be much appreciated.

.

What about the old front derailleur? Can you use that or at least use it for a donor?

 

[jongooligan]

Divided

Glad someone spotted this. If you multiply the circumference by 3.14 you'd have a front derailleur that would fit on a drainpipe.

 

[Serge]

Chain fitting is easy so long as you are careful not to accidentally push the rivet right through the outer link plate when you split it. I just leave the chain on the BB not on the chainrings so there is no tension on it. Shortening them then getting them to go back together afterwards is more fun & games though.

That's what I did, pushed the pin all the way through. I do like to make life difficult for myself!

Thanks for the tip, I'll know better next time.

 

[Serge]

Without putting the chain through the back derailleur, drape it over the big ring on the front and the big sprocket on the back.
Put your finger where the chain meets, add 2 links if joining with a pin, cut.
Or, even better, add one link, cut, then join with a quick link.
Take chain off, put it back on, anytime you like with a quick link.
Here's a video.

Thanks for that.

 

[Serge]

What about the old front derailleur? Can you use that or at least use it for a donor?

I dug the old one out of the parts bin last night:

I'm not too keen on putting that on my shiny new bike.

 

[Threevok]

A little difficult to see, but it's fully tightened and is still a little wobbly. Some form of spacer is required (no doubt it had one and I've dropped it). More bodging required methinks.

If you look at the inside of the clamp there's a two-part adapter. You should have had two sets - one already on the clamp and a thicker one, which is the one you need.

You need to remove the one on there and replace it with the thicker one (they are held on by sticky pads)

If you cannot find the thicker set, you may need to source another. I may have some in the toolbox

 

[Vantage]

I dug the old one out of the parts bin last night:

View attachment 426430

I'm not too keen on putting that on my shiny new bike.

Give it a good clean and you'll not notice the difference.
My last cockup was trying to run my new chainset on my old bottom bracket having forgotten to check the specs. That's after 20+ years of building and fettling my own bikes.
You're doing a bloody good job there

 

[Serge]

If you look at the inside of the clamp there's a two-part adapter. You should have had two sets - one already on the clamp and a thicker one, which is the one you need.

You need to remove the one on there and replace it with the thicker one (they are held on by sticky pads)

If you cannot find the thicker set, you may need to source another. I may have some in the toolbox

Thanks for the advice. However, I've managed to come up with an alternative solution involving this:

Yes, that is the handle from a Vileda Super Mop (I'm sure you all recognised it).

Quick measure, then to work:

Loosen off the derailleur and slip it on to the seat tube:

Refit the derailleur:

And voilà! Job done.

Who needs specialist parts?