Bicycles Asked on December 11, 2020
I will be putting road drop bars on one of my mtb’s for this coming winter as a project that has Shimano 10 speed 1x Deore.
My goal is to "simply"?? have road shift levers and hydraulic brakes with good shifting and braking performance.
Here is my setup can some tech cyclist help me figure out my cheapest options? All the different leverage ratios for 10 speed across mountain and road (and now GRX) gets quite confusing. I would like to stay 10sp.
Thanks !!!
Here is the bike and I have 5 other (1 road, 2 gravel, 2 other fs mtb’s currently built up with too many frames to count) so this is going to be my only e-bike:
https://www.marinbikes.com/bikes/20-nail-trail-e1
Current Setup:
Thanks to everyone's great help here is the solution that seems like it would work out for me, yrmv (remember this is just a theoretical setup.) Want to stay with as much as OE as I can since just winter setup, 10sp 4700 tiagra levers (same shim 11 sp road cable pull ratios including grx so can't just use any rear derailleur even though is 10sp that gets complicated see # in references and other threads.), splice in xt calipers to the levers (same cost as going with flat mount to post mount adapters which are freakin 40 bucks each.) Use a GRX RD-RX812 11 sp max 42t rear d. Will handle =~ 46t in many setups' and as scene* seems to shift fine as a 10sp d. Why Shim does not make things compatible across mtb and road anymore since 9 or 10 speed I forget when they were. If Shim hydraulic 11 speed road levers worked with mtb stuff, why have GRX$ ? Same reason gravel frames slowly are getting more clearance. They are mountain bikes hardtail frames are mostly with drop bars that Tomac use to race in the 90s (we started doing it in the 80s). https://roadbikeaction.com/the-origins-of-fat-tires-drop-bars/ That is pretty much it. All of the documentation and references are in the comments from all the help and research above. *
More supporting references: https://bikepacking.com/bikes/corvid-cycles-map/https://www.facebook.com/watch/?v=727469104375415&extid=DtFEHaupmPoJLo43
Correct answer by Jim on December 11, 2020
Hydraulic brake levers and brake calipers are in general not interchangable.
Shimano MTB 10 speed rear derailleurs do not work with road levers.
You already encountered GRX. It has a 2x10 option, RX400. The rear derailleur is not designed for 1x, however, it has a clutch (Shadow+) and is rated to 46t. I expect it will work well enough in a 1x set up.
Also check chain line. The MTB has the chainring mounted further to the right. For the low gears (many teeth) the chain might have to angle far to the left.
Check brake caliper compatibility with your frame. GRX calipers are attached with the flat mount standard. Adapters for flat mount brakes to mount on IS ir post mount frames have been designed already. The adapters may be hard to find and pricey though.
Answered by gschenk on December 11, 2020
There are two problems in your plan.
Firstly, it's almost impossible to find road drop levers for hydraulic brakes without shifters. Thus you're stuck with levers that have integrated shifters.
Secondly, in their infinite wisdom, Shimano has made road levers incompatible with the cable pull ratio needed by MTB rear derailleurs. Thus, if you select a lever with shifter, it's not going to be compatible.
Normally, in situations like this I would recommend bar-end shifters and brake levers without shifters. The bar-end shifters are compatible with practically anything, especially in the front (also in the rear too if you stick with friction shifting). However, I doubt there is a bar-end shifter compatible with 10 speed MTB rear derailleur cable pull ratio -- they are usually made for road ratios. Also, finding hydraulic road drop levers without shifters is going to be a challenge.
In theory, some bar-end shifters allow friction shifting in the rear after turning a switch. However, in practice, you probably won't want to be shifting all the time this way.
It unfortunately seems the DIY market is not well catered for in today's environment, and you would need to change so many parts of your bike that the conversion is not going to be cheap.
The situation was entirely different when I converted a 3x8 speed hybrid bike to a 2x8 speed drop bar bike. It had V brakes (fortunately road drop levers are available for the V brake cable pull ratio), and the 8 speed Ultegra bar-end shifters worked perfectly, as 8-speed road and 8-speed MTB cable pull ratio is the same (with the exception of some old Dura-Ace parts).
Answered by juhist on December 11, 2020
The only road shifter compatible with a Shimano 10 mountain RD is the Microshift BS-M10.
If you went BS-M10 you could use TRP Hylex brakes to stay hydro.
A number of bikes have been released with those exact components with Shimano 1x10 or 2x10 mountain drivetrains. It works fine if you're amenable to bar ends.
Other than the above, to get 1x10 with brifters and hydro and re-use your RD, all the options are seriously contrived, like buying the 1x11 hydro GRX STIs only to also buy a Jtek for them. Apex 1ing the bike will be cheaper.
Answered by Nathan Knutson on December 11, 2020
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