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What's the I-Spec technology for:
By creating the I-Spec clamps, Shinano not only eliminated the clamp, but also brought a gain in ergonomy with controls closer to the fingers and easier to handle. There are several versions of the I-spec technology: A, B, II and EV
The latest evolution of the Shimano standard, I-spec EV provides greater flexibility in lever positioning to stay focused on riding.
The I-Spec EV components are only compatible between themselves.
This standard brings additional stiffness to the set by adding a point of contact between the end of the lever and the handlebar
The new Shimano seatpost control is I-Spec EV compatible which allows for a more ergonomic positioning similar to that of the shifters

The standard I-Spec II has a half shell that fits inside the brake collar (which is therefore clamped to the handlebars by the brake collar) on which the speed control is attached.
The I-Spec II components are only compatible between themselves.
How to differentiate:
I-Spec A : First generation, it is characterized by a threaded attachment with a small hook.
I-Spec B : It is a shorter threaded fastener without a hook unlike the first version.
An I-Spec A compatible brake can be used with an I-Spec A and B shifter, but an I-Spec B brake can only be compatible with an I-Spec B shifter.
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| Chainrings |
2 3 |
| Groupset | Shimano Deore XT |
| Speed | 11 |
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