Reeses

I recently crashed and ****ed up my right Tiagra 9spd shifters. I'm taking this opportunity to upgrade to 105 shifters, however I've only been able to find 105s in 3x10.

Would a 10 speed shifter be compatible with a 9 speed rear derailleur? I'm using a Tiagra 9 speed cassette with it.

EDIT: The rear derailleur is a 10-speed.

JTGraphics

Indexing is not the same the derailleur is fine, its the cassette their are ways to get it to work but you may be better off just picking up a good used or new 10 speed cassette to work with it.

Reeses

I see. And the 9-speed derailleur will be compatible with a 10 speed cassette?

fietsbob

expect Rt lever and cassette are a pair, keep them like that.

JTGraphics

Yes do you have a 10 speed cassette already? and you just need to setup the front to index on only 2 rings if you use the front 105 with a double up front.

Reeses

I have a triple front and no I don't have a 10 speed cassette. Id have to get the shifters, cassette and 10spd chain right? I'm thinking of just getting replacement Tiagra levers now

JTGraphics

Cassette yes chain maybe but would be a good idea to do so. I have a few good 10 speed cassettes around for sale, you in LB? wife is having a yard sale this weekend I may have a few out for sale. PM me if interested.

Wilfred Laurier

i have never in my life read
such confusing advice
i dont know if it was correct or incorrect

a 10sp shifter will not index properly with a 9 speed cassette
the amount of cable pulled per click is different between 9 and 10 sp shifters


you could change to a 10sp cassette
9 sp rear derailleurs move the same amount per unit of cable pulled
as 10 sp derailleurs
so 10 sp shifter + 9 sp derailleur + 10 sp cassette = good
10 sp shifter + 9 sp derailleur + 9 sp cassette = no

and you need the chain to match the cassette

Reeses

Thanks for clearing that up; and JTGraphics I PM'ed you.

hyhuu

OP - Do a quick search on "10 sp shifter on 9 sp drivetrain". It works but you have to change the where the cable attached to the RD. It's called "alternate cable routing" as shown by Shelddon Brown on this link https://sheldonbrown.com/derailer-adjustment.html Look for "postion B". Plenty people have used it and it shifts flawlessly. Also a RD doesn't know or care what speed it is called.

Wilfred Laurier

some do

there are various product lines from different manufacturers
that have different cable pull ratios
for derailleurs intended for different number of cogs

including but not limited to
shimano and campy

hyhuu

I'm sure. But the OP is asking about his Tiagra setup and that one doesn't know or care.

Wilfred Laurier

bad generalization

most indexed shimano shifters will work with that rd
if the number of cogs matches the number of clicks
but there are many shifters
even shimano shifters
that will not produce the same results

10 sp mtb shifters
and 8 speed or less dura ace are two examples

hyhuu

You are the one who over generalized and babling too. I am answering the OP's post, which specifically deals Shimano Tiagra 9sp and 105 10sp system. The setup showed on Sheldon Brown'site works for me and the last guy who asked on the forum and countless others who asked here or on other internet forums. I was just showing him that it would work. I don't understand what is your problem. If you want to show your vast knowledge of bicycle indexing systems then write an article and post it. I would definitely read it. But there is no need to distract from what the OP is seeking here.

hyhuu

OP- Here is the link to the last thread about the same topic https://www.bikeforums.net/showthread...-spd-csassette. As in his last post and many others who have contributed to it:"it works flawlessly"

Reeses

Thanks for the Sheldon Brown link! And it turns out that my rear derailleur is actually a 10 speed. I'll try out the alternate routing when the shifters get here

gsa103

The older 5500/6500 105/Ultegra shifters are 9-speed.

One other thing to watch for is that Shimano changed the brake pull ratios with the recent 10-speed 5700/6700 sets, and your brake performance may suffer if you mis-match. Given that its a rear brake, not that big a deal.

hyhuu

Report back after you try it. The speed designation of your rd is strictly marketing.

anixi

I believe that the chain spacing between Shimano 9 and 10 speed rear derailleurs is slightly different. i.e. I wouldn't expect a 9-speed chain to play nice in a 10-speed rear derailleur. The pull may be the same, but, you certainly might get some chain rub with a 9chain/10rd combination. Please correct me if I'm wrong....

hyhuu

For RD, it doesn't matter. The shifting is done by the pulley riding on the inside of the link and the internal width between inner plate is always the same. For FD, the shifting is done by pushing on the outter plate so the width does play a role but since the difference is quite small. Some people refers the 9 sp FD on a 10 sp to minimize rubbing when crossing chain.

Reeses

I've had a 9-speed chain with my 10-speed derailleur for over a year now.

Kimmo

Reeses, if I was you, I'd try to find NOS 105 3x9 STIs. Shimano's 10s cable pull is stupidly short, and is intolerant of all the usual cable maladies to a greater extent than any other system.

Until yesterday, I would have yes... but: https://www.bikeforums.net/showthread...-compatibility

Yesterday I had a 8s chain running just fine through a 10s RD; not even close to rubbing.

Problem was, it appears (and I'm told, by one guy, at least) the parallelogram geometry is subtly different on 10s RDs and although the total sweep is about right, it results in a non-linear response in the middle of the cassette. My mate reckons it can work, but it's definitely sub-optimal. Yesterday, I was working with all new parts except for the 2200 brifters (RD hanger checked too), and nothing I did (including various cable clamping methods) could get it not to suck.

I looked like a putz because I contradicted his experience with the gospel I got on here. He reckons he read it in a manual somewhere.

Reeses

I already ordered new 105 levers. I'll see how that goes. I'm not quite sure what you mean by short cable pull, but my friend has had a 105 group and he's happy with it.

Also, I found out my derailleur is actually a ten-speed so I won't hafta worry about the whole 9spd derailleur vs 10spd cassette thing.

Reeses

Shifters came in today. The front shifting was ok but as expected the rear was problematic. It would shift okay through the first 4-5 smaller cogs but it'd become less smooth as the cogs got bigger.

I used the alternate cable routing but yielded almost the same effects as normal routing.


Edit: I tried the alternate cable routing again and it shifts smoothly now. However the left shifter has been difficult to shift. There's no "click" when shifting up to the biggest chainring and it takes quite a bit more effort than shifting to the big ring on my Tiagras.