Downtube Shifter

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Ontherivet77
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Downtube Shifter

Postby Ontherivet77 » 5 Nov 2019, 2:42pm

Will any LH friction downtube shifter work with a Shimano Tiagra 4500 front mech?

KM2
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Re: Downtube Shifter

Postby KM2 » 5 Nov 2019, 2:48pm

It should do, if it pulls the correct length of cable.

Ontherivet77
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Location: Lancashire

Re: Downtube Shifter

Postby Ontherivet77 » 5 Nov 2019, 3:24pm

KM2 wrote:It should do, if it pulls the correct length of cable.


How do you establish what cable pull is needed?

philvantwo
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Re: Downtube Shifter

Postby philvantwo » 5 Nov 2019, 4:12pm

Brucey will know!
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mercalia
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Re: Downtube Shifter

Postby mercalia » 5 Nov 2019, 4:30pm

usually they have a stop/clickless mode so will work, though why any one wants to use a downtup shifter these days escapes me.

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foxyrider
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Re: Downtube Shifter

Postby foxyrider » 5 Nov 2019, 4:54pm

mercalia wrote:usually they have a stop/clickless mode so will work, though why any one wants to use a downtup shifter these days escapes me.


Why? because its the only running bike i have at my disposal? :D Yes indeedy was out today on my very old skool commute/hack bitsa which is running 2x7 with d/t shifters, the LH is friction, the RH is indexed. Was very surprised at how easily i adapted to using the old technology again after decades of using Ergo's / STi's.
Convention? what's that then?
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reohn2
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Re: Downtube Shifter

Postby reohn2 » 5 Nov 2019, 4:56pm

Ontherivet77 wrote:Will any LH friction downtube shifter work with a Shimano Tiagra 4500 front mech?

A friction lever/shifter will work with any front mech,or rear mech FTM.
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freiston
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Re: Downtube Shifter

Postby freiston » 5 Nov 2019, 5:44pm

reohn2 wrote:
Ontherivet77 wrote:Will any LH friction downtube shifter work with a Shimano Tiagra 4500 front mech?

A friction lever/shifter will work with any front mech,or rear mech FTM.

Aren't there some mechs that require a total cable pull (to get the full range of gears) which is greater than some friction shifters can manage?
Disclaimer: Treat what I say with caution and if possible, wait for someone with more knowledge and experience to contribute. ;)

scottg
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Re: Downtube Shifter

Postby scottg » 5 Nov 2019, 5:50pm

If you are running 11s rear, you may need a larger shifter barrel.
the front shifter is normal size.
Retro-friction on both levers.

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rjb
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Re: Downtube Shifter

Postby rjb » 5 Nov 2019, 5:52pm

If you need to pull more cable increase the diameter of the lever. Easy trick to do this is to slip a suitable short length of pvc tube over the cable at the shifter end. The insulation you strip from 3 core mains cable when wiring a plug is a good source. :wink:
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DNC123

Re: Downtube Shifter

Postby DNC123 » 5 Nov 2019, 6:01pm

rjb wrote:If you need to pull more cable increase the diameter of the lever. Easy trick to do this is to slip a suitable short length of pvc tube over the cable at the shifter end. The insulation you strip from 3 core mains cable when wiring a plug is a good source. :wink:

Didn't Shimano supply something like that to allow 7 speed shifters to be used with 6 speed mechs and blocks? Came in the box didn't it?

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Gattonero
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Re: Downtube Shifter

Postby Gattonero » 5 Nov 2019, 6:09pm

Ontherivet77 wrote:Will any LH friction downtube shifter work with a Shimano Tiagra 4500 front mech?


Mostly, yes.
The travel on a double-chainset is not that long so almost any Lh friction shifter will do. The problem arises when the shifter is not able to hold the tension.
That is the reason why old Shimano thumbshifters (so are my old Deore Xt and DX) had a "reversed" spring that made the lever a bit harder to go down (to compensate the spring pulling down), this also made it a bit easier to win the spring of the derailleur.
Micro-indexed (or "retrofriction", as some of the Simplex were) will work well too.
Just avoid a shidter that is a bit loose and won't hold the cable tension, of course you ought to have the plastic concave washer inside the shifter, that's correctly fitted and not too worn
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reohn2
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Re: Downtube Shifter

Postby reohn2 » 5 Nov 2019, 8:25pm

freiston wrote:
reohn2 wrote:
Ontherivet77 wrote:Will any LH friction downtube shifter work with a Shimano Tiagra 4500 front mech?

A friction lever/shifter will work with any front mech,or rear mech FTM.

Aren't there some mechs that require a total cable pull (to get the full range of gears) which is greater than some friction shifters can manage?

Not that I'm aware of,but I stand corrected if there are.
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Brucey
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Re: Downtube Shifter

Postby Brucey » 5 Nov 2019, 9:03pm

Ontherivet77 wrote:Will any LH friction downtube shifter work with a Shimano Tiagra 4500 front mech?


yes, pretty much.

BTW there is something to be said for the simplicity of DT friction levers; once they are set up and working, they might outlast everything else on the bike.... And is there any substitute for the little glow of satisfaction that accompanies a well-executed one-handed double-shift...?

cheers
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nsew
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Re: Downtube Shifter

Postby nsew » 5 Nov 2019, 9:57pm

CX-3 wrote:
rjb wrote:If you need to pull more cable increase the diameter of the lever. Easy trick to do this is to slip a suitable short length of pvc tube over the cable at the shifter end. The insulation you strip from 3 core mains cable when wiring a plug is a good source. :wink:

Didn't Shimano supply something like that to allow 7 speed shifters to be used with 6 speed mechs and blocks? Came in the box didn't it?


This one. I concur with Brucey’s comments above. I use 7 speed bar end shifters fired from the centre of drop bars but they don’t quite match the positivity of 7 speed downtube shifters.
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