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Tiagra question

Old 05-08-21, 07:14 PM
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Krix
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Tiagra question

Hi guys,

I have a Tiagra ST4700 10 speed STI and a 11-42 Deore Cassette 10 speed.

is there any way for me for this to work? What rear derailleur and hubs should I buy? Will i need to buy a road link?

Thank you
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Old 05-08-21, 07:16 PM
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Originally Posted by Krix View Post
Hi guys,

I have a Tiagra ST4700 10 speed STI and a 11-42 Deore Cassette 10 speed.

is there any way for me for this to work? What rear derailleur and hubs should I buy? Will i need to buy a road link?

Thank you
A road derailleur will not wrap 42t, I believe the max is 34.
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Old 05-08-21, 07:18 PM
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Originally Posted by DorkDisk View Post
A road derailleur will not wrap 42t, I believe the max is 34.
how bout an mtb derailleur? Maybe like deore m4120 sgs
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Old 05-08-21, 07:22 PM
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Originally Posted by Krix View Post
how bout an mtb derailleur? Maybe like deore m4120 sgs
The M4120 long cage will wrap 42t. The shifters have to be compatible with the derailleur though.
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Old 05-08-21, 07:28 PM
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Originally Posted by DorkDisk View Post
The M4120 long cage will wrap 42t. The shifters have to be compatible with the derailleur though.
i have a STI Tiagra ST4700. Will it be okay?
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Old 05-08-21, 07:31 PM
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Originally Posted by Krix View Post
i have a STI Tiagra ST4700. Will it be okay?
I don't think so, the cable pull is different. GRX RX812 will work
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Old 05-08-21, 07:44 PM
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Originally Posted by DorkDisk View Post
I don't think so, the cable pull is different. GRX RX812 will work
Please correct me if im wrong but GRX needs to be in DI2? I am not sure what it is though but it's different from the cables right? Will it be okay?
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Old 05-08-21, 08:05 PM
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Tiagra 4700 is an odd duck. 10 speed but uses 11 speed road cable pull on 10 speed cassette.

​​​​​​Science Behind the Magic | Drivetrain Compatibility ? Art's SLO Cyclery
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Old 05-08-21, 08:24 PM
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Originally Posted by Krix View Post
Please correct me if im wrong but GRX needs to be in DI2? I am not sure what it is though but it's different from the cables right? Will it be okay?
No, if it is a cable pull GRX der then it will work with 4700 Tiagra. I'm not familiar enough with GRX to know if there is a DI2 line, maybe in the 800 level, but the 400 series is 10sp cable, and the 600 series is 11sp cable.
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Old 05-08-21, 08:44 PM
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GRX is available in Di2 or cable. The cable pull is 11sp road, the same as Tiagra 4700 10sp.
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Old 05-08-21, 10:05 PM
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Originally Posted by DorkDisk View Post
The M4120 long cage will wrap 42t. The shifters have to be compatible with the derailleur though.
Aye, that's the rub. According to Art's Cyclery (Science Behind the Magic | Drivetrain Compatibility ? Art's SLO Cyclery), Shimano an 11-speed road rear shifter pulls 3.1mm per click. Shimano 10-speed pulls 2.3 mm. Shimano 10-speed mountain derailleurs want 3.4 mm. Tiagra 4700 works like Shimano 11 but for 10, so, for lack of better info, I'd assume it pulls 3.1.

By the way, riders have been mixing Shimano 10-speed road (2.3 mm) with 9-speed MTB (2.5 mm) with considerable success. Buena sera.
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Old 05-08-21, 10:37 PM
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When I go the Art’s it shows...
Shimano 10 speed Road cable pull = 2.3mm
Shimano 11 speed Road cable pull = 2.7mm

10 speed cassettes are spaced at 3.95mm ctc.
11 speed cassettes are spaced at 3.74mm ctc.

I think it is just math.
10 speed road RD actuation - 3.95/2.3 = 1.7
11 speed road RD actuation - 3.74/2.7 = 1.4

Tiagra 4700 shifter cannot pull the same as 11 speed cable pull because you can use an 11 speed RD and move it 3.95mm.

Tiagra 4700 pull - 3.95/1.4 (RD actuation) = 2.8mm cable pull.

If it is correct that any Shimano 11 speed road RD works with Tiagra 4700 shifters, then 11 speed GRX RD should work with Tiagra 4700 shifters and a 10 speed cassette.

John
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