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TA Chinook 104mm BCD 4 Arm Middle Chainring - Black

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SJS Cycles part number :

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Details

The Chinook 104 range was changed to cater for far reaching technical gear system developments. The new generation middle rings have two pairs of shortened teeth to assist down-shifting.

- BCD: 104mm
- Compatible: 8/9 speed
- Options: 32, 34, 36, 38, 40, 42T
- Material: AL 7075 T6

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Questions & Answers (5)

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By Craig

24 Jul 2023

I am using Thorn 104/64 PCD Triple Crankset MK2 and want to run it as a double with TA Chinook 104mm BCD 4 Arm Middle Chainring 42t and TA Chinook 64mm BCD 4 Arm Inner Chainring 28t.
Just double checking that the 42t middle ring has the appropriate pins and ramps and will shift well with the 28T.

SJS Customer Service:

The chainrings do have shift ramps, the jump from 28 to 42t is quite large so shifting will not be a smooth as it would be with a narrower gap. SK 24/07/23

Bike fitter has suggested Shimano 9 speed 38 tooth Middle Ring 104 BCD. Is the Chinook compatible?

By Kenneth Aspinall

17 Apr 2022

SJS Customer Service:

Thank you for your enquiry, yes fully compatible

WD 19/04/22

Is this chainring completely black or as per picture with silver edge?

By James

05 Oct 2020

SJS Customer Service:

Hello, The item is the same as seen in the photo.

Use as single with 8 sp cassette?

By Anonymous

01 Apr 2020

Can I use this ring as a single chain ring set up with a wide ratio (11-40) rear cassette and an 8 speed chain?

SJS Customer Service:

yes

Is this compatible?

By Otto87

10 Aug 2018

Is this compatible with a "Thorn 104/64 PCD Triple Crankset MK2 - Black" (SJS Cycles part number : 31813l170)?
If it is what would be the chainline if I just used only this chainring? (Would it be 54mm as that's the one I'm looking for for my Rohloff upgrade with the 110mm BB as described in the specifications for Thorn Cranks? )

Best Regards,
Otto

SJS Customer Service:

Yes you could use this, but we would recommend SJS Cycles part number : 11054S32 as it is designed as a single chainring. The TA is designed for 8/9 speed shifting and have two pairs of shortened teeth to assist down-shifting.

You should get the appropriate chainline if fitted to the outer position.

Thanks