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I have this MTB with Deore M5100 groupset (2 x 11 speed) and I want to convert this MTB to gravel bike. (Converting from straight bars to drop bars.) Is there any brifter compatible for this series? Has anyone tried something similar?

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  • To clarify, you want to replace two existing flat-bar shifters with drop bar STI brifters that are compatible with the existing parts?
    – Criggie
    Feb 21 at 5:15
  • Yes, that only. I am pretty new to bicycle stuffs. My budget only allow me to get MTB instead of gravel bike. After amassing some funds, I would upgrade it.
    – auphali
    Feb 21 at 6:55
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    you know your MTB can ride pretty much anything a gravel bike can? You can even ride a MTB on the road, they're not just reserved for mountains.
    – Criggie
    Feb 21 at 7:46
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    @auphali: Just in case you are not aware: Drop bars put your hands much more forward. You’d probably also need a much shorter stem, unless the frame/stem was too short to begin with.
    – Michael
    Feb 21 at 17:37
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    "My budget only allow me to get MTB instead of gravel bike...". Probably not the best path. Its not an upgrade, its a repurpose. Frame geometry for flats and drops is very different, and while it can be made to work, it will always be a compromise.
    – mattnz
    Feb 21 at 18:57
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There are no Shimano brifters that are 2x11 compatible, but Microshift manufactures some. I use a Microshift SB-110 (1x11) and a bar-end shifter for a drop-bar 3x11 setup with an XT rear derailleur (RD-M8000) and XTR front derailleur (FD-M9000) with no issues.

Here is Microshift's product page for the SB-110: https://www.microshift.com/en/product/sb-m110/

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    Excellent spotting - thank you and welcome to the site!
    – Criggie
    Feb 21 at 18:58
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As already noted in other answers, there is no compatible unit. The pull ratio is different.

However, given the typical prices of brifters and derailleurs, I think it would be better to buy a new 11-speed derailleur that is compatible with your new brifters - such as the Shimano GRX.

It will be better than some extra units for pull ratio conversion.

The front derailleur might be necessary too, but it is even cheaper.

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Unfortunately 11 speed MTB and 11 speed road have different pull ratios.

You could use this adapter/converter: https://www.wolftoothcomponents.com/products/tanpan

Wolftooth Tanpan

It should allow you to keep using your existing rear derailleur and cassette.

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    I second this. This is the cheapest and arguably, the simplest option when you want to use an MTB RD with STI levers.
    – Lien028
    Feb 21 at 15:17
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    Though cheap is relative, the Tanpan costs 46€. You can get a new Shimano 105 or GRX rear derailleur for the same price.
    – Michael
    Feb 21 at 17:33
  • Recall that MTB Shifters have different pull ratios compared to their counterpart road shifters. Hence, pairing a Deore shifter with a 105 or GRX RD would result in a headache.
    – Lien028
    Feb 24 at 10:35
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Assuming your shifters are SL-M5100

Then the product matrix at https://productinfo.shimano.com/#/com?cid=C-432&acid=C-435 says no.

Sadly the "gravel bike" specific groupsets are based on road bikes so have road bike pull, and deore is MTB pull.


Your solution might be to replace the shifters with ST-RX810-R and ST-RX810-L which is 2x11 speed GRX, and the rear mech with RD-RX800-GS or RD-RX810 or RD-RX815, and the front mech with a FD-RX810-F or FD-RX815.

This also depends on if you have cable or hydraulic brakes.

Store the take-off parts in case you want to revert later.

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I have this MTB with Deore M5100 groupset (2 x 11 speed) and I want to convert this MTB to gravel bike. Is there any brifter compatible for this series?

Unfortunately, the times are not good for doing flat bar to drop bar conversion.

I did such a conversion on a bicycle with V brakes and 8 speed drivertrain. I only needed bar-end shifters and drop bar V brake levers, plus the drop bar of course. Back then the times were different. Shimano wasn't making everything incompatible between drop bar and flat bar on purpose. Yep, Shimano didn't sell drop bar V brake levers but third party manufacturers came to the rescue.

There is no brifter and no bar-end shifter (or downtube shifter) compatible with the Deore M5100 rear derailleur cable pull ratio. Unless you like friction shifting in which case it might be doable with bar-end or downtube shifters (but due to the long cable pull you might find the range of the friction shifter isn't enough for all the gears).

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