105 Front Derailleur wont fit

[Jimmy Welch]

Morning I've upgraded my Claris 8 speed groupset to 105 all well apart from the front derailleur doesn't fit the seat post snuggly and there's play in it even after fully tightened. Is there a hack for getting it to fit tight it's a simple band on type

 

[Dogtrousers]

Coke can shim?

 

[Jimmy Welch]

Coke can shim?

Go on mate , I did consider making a shim out of bartape but this sounds like you know something better

 

[Paulus]

Measure the external diameter of the seat tube, then measure the front derailuer internal diameter then buy the correct sized shims to make up the difference from your local bike shop.
Failing that, as @Dogtrousers says, cut up a tin can and wrap it around the seat post to take up the slack.

 

[Dogtrousers]

Go on mate , I did consider making a shim out of bartape but this sounds like you know something better

I never know better.

A bit of tape. A bit of coke can maybe. A bit of both ... Just something to pad it out a bit. Bodge bodge bodge. Or get something purpose made as @Paulus suggests.

 

[Jimmy Welch]

I never know better.

A bit of tape. A bit of coke can maybe. A bit of both ... Just something to pad it out a bit. Bodge bodge bodge. Or get something purpose made as @Paulus suggests.

Cheers ill give it a go

 

[ColinJ]

Maybe buy a replacement band of the correct size? I'm sure that they must be available.

Or ask on the forum if anyone has something they could donate?

I don't have callipers for measuring the diameter of tubes to make sure to get the correct size. My hack is to close the Jaws of a 30 cm (12") adjustable spanner on the tube and then measure the distance between them.

 

[Jimmy Welch]

Daft question the old Claris front derailleur fits perfectly is there any reason why I just can't use this with the new 105 set up

 

[ColinJ]

Daft question the old Claris front derailleur fits perfectly is there any reason why I just can't use this with the new 105 set up

I reckon that would work.

About my previous post... I was thinking of band-on to braze-on adapters. I had one on a bike that didn't have a braze-on tab. My suggestion wouldn't work if the 105's band is permanently attached.

 

[Ian H]

I never know better.

A bit of tape. A bit of coke can maybe. A bit of both ... Just something to pad it out a bit. Bodge bodge bodge. Or get something purpose made as @Paulus suggests.

Aluminium drinks can is the perfect shim material. No bodging involved. There was even a book about it.

 

[Dogtrousers]

Aluminium drinks can is the perfect shim material. No bodging involved. There was even a book about it.

You can't leave us hanging like that. What book?

Mind you, there may be no bodging involved in the hands of a skilled mechanic. But I'm afraid whenever I do things like that, they are bodged.

 

[fossyant]

Provided the band fits, you can use it. If you go down the coke can bodge, just cover the tin in electrical tape to provide additional grip and protect the paint (plus will look better.

A World of stuff like this on ebay..

https://www.ebay.co.uk/itm/40421285...rQVHA03LPqNf3nAKJ9I77UbfI-79VxRhoCu0kQAvD_BwE

 

[T4tomo]

Daft question the old Claris front derailleur fits perfectly is there any reason why I just can't use this with the new 105 set up

If the FD/ Shifter pull ratio is same on Claris to 105 then no issue - but you'd need to check the technical documents to determine that. (or just try it!!!)

The RD / Shifter pull ratio is definitely different between 8 and 11/12 speed shimano (you haven't specified what type of 105 it is!)

 

[fossyant]

FD's don't need a pull ratio. Only difference would be a triple/double.

 

[Ian H]

You can't leave us hanging like that. What book?

Mind you, there may be no bodging involved in the hands of a skilled mechanic. But I'm afraid whenever I do things like that, they are bodged.

https://en.wikipedia.org/wiki/Zen_and_the_Art_of_Motorcycle_Maintenance