LTWOO eGR

[trcycling]

So, the installation gets serious and raises another question:

I was told by the seller that the brake calipers are post-mount compatible (only in fact which I'm not sure can be true). Conveniently my V1 Cutthroat frame/fork are post mount. But the brake caliper, adapters and bolt kit seem to be sized for and include M5 bolts. Post mount is M6... Any thoughts?

BTW, the RD went on and set up pretty easy. I was a dummy and started individually calibrating before doing the macro. Duh, the instructions say to do the macro on the 7th sprocket (6th on 11s) first. It's just that the app opened on the micro adjustment page and I forgot. So when I finally figured it out, I had to repeat the cycle.

No big deal. Just follow the directions and it's easy. It also shifts nicely in the stand even up to 50t. We'll see how it works 'under fire' on the road after I sort out the brakes.

[Serge_K]

my er9 included all imaginable bolt lengths and adaptors for 140 to 160mm discs, something that costs extra and requires significant brain damage on Shimano. I think a very small fraction of the market cares about post mount (at least on the road setups), i wouldn't even want to pay for the shipping cost of bolts of another thread size. Shipping from China is a large portion of the cost of everything we ride in the West. 

[trcycling]

my er9 included all imaginable bolt lengths and adaptors for 140 to 160mm discs, something that costs extra and requires significant brain damage on Shimano. I think a very small fraction of the market cares about post mount (at least on the road setups), i wouldn't even want to pay for the shipping cost of bolts of another thread size. Shipping from China is a large portion of the cost of everything we ride in the West.

Yes they do include a generous collection of hardware. Unfortunately a) I asked and was told they were post mount and b) the calipers are using an 70mm spacing that looks like post mount but uses M5 bolts like flat mount. Something I read tonight suggested that this is one flat mount standard (the ones on my road bike are much narrower at 30something mm) The included adapters are also 70mm rather than the post mount standard 74mm (seriously, who in the industry decided to invent a new flat standard 4mm different and using one size different bolts? ) I thought about drilling it out but there isn’t enough material in the right places. I also do not find anyone doing flat to post adapters for the 70mm flat variant.

And while you’re right about drop bar bikes being more likely to use flat mount, this is a gravel group set where post mount is not rare.

So, now I’m wondering what calipers might be compatible with the LTWOO levers. I know that early on they were bundling with other makers calipers, so I’m guessing the piston ratios are probably common. Maybe Shimano compatible since they went with mineral oil. If so, that would be great since apparently pretty much all Shimano calipers are compatible including across road and mountain groups.

[f4keit]

Yes they do include a generous collection of hardware. Unfortunately a) I asked and was told they were post mount and b) the calipers are using an 70mm spacing that looks like post mount but uses M5 bolts like flat mount. Something I read tonight suggested that this is one flat mount standard (the ones on my road bike are much narrower at 30something mm) The included adapters are also 70mm rather than the post mount standard 74mm (seriously, who in the industry decided to invent a new flat standard 4mm different and using one size different bolts? ) I thought about drilling it out but there isn’t enough material in the right places. I also do not find anyone doing flat to post adapters for the 70mm flat variant.

And while you’re right about drop bar bikes being more likely to use flat mount, this is a gravel group set where post mount is not rare.

So, now I’m wondering what calipers might be compatible with the LTWOO levers. I know that early on they were bundling with other makers calipers, so I’m guessing the piston ratios are probably common. Maybe Shimano compatible since they went with mineral oil. If so, that would be great since apparently pretty much all Shimano calipers are compatible including across road and mountain groups.

Not sure about Ltwoo's electronic groupsets but I am running a GRX400 front caliper with my Ltwoo GRT groupset since the mounting brackets for their caliper were not compatible with my fork.

[FabioZang]

...... a) I asked and was told they were post mount and b) the calipers are using an 70mm spacing that looks like post mount but uses M5 bolts like flat mount. ......

......

So, now I’m wondering what calipers might be compatible with the LTWOO levers. ......

What I want to say is that Ltwoo does not adhere to any known standards, whether it's flat mount or post mount. Ltwoo has designed its own specification and provides a bracket with the kit to install it on most flat mount frames. Therefore, you will find that the included screws are M5 size, not M6. Additionally, this Ltwoo-specific specification was not initially designed to accommodate post mount frames, meaning it cannot be installed on any post mount frame.

As for the second question, it is actually easily solvable. Any Shimano hydraulic disc brake caliper compatible with mineral oil systems can be used with Ltwoo's control lever, including but not limited to models like MT200, M6100, R7170, GRX400, and so on.

You just need to ensure that the syringe, olive head, and hose are compatible. I recommend using BH90 components across the board because BH90 hoses can be directly installed on all BH59 compatible components. As long as you ensure proper hose installation, you don't have to worry about any compatibility issues.

I have paired my GR9 control lever with the UR300 flat mount caliper using BH90 hose, syringe, and olive head, and the braking performance and feel are excellent. I have been using it smoothly for nearly 5,000km without any issues of brake fluid leakage or loss of braking power. So, feel free to boldly pair them together.

[raisinberry777]

So, now I’m wondering what calipers might be compatible with the LTWOO levers. I know that early on they were bundling with other makers calipers, so I’m guessing the piston ratios are probably common. Maybe Shimano compatible since they went with mineral oil. If so, that would be great since apparently pretty much all Shimano calipers are compatible including across road and mountain groups.

Basically any Shimano caliper should work - pick up a set of their basic MTB ones for your post mount fork.

[trcycling]

What I want to say is that Ltwoo does not adhere to any known standards, whether it's flat mount or post mount. Ltwoo has designed its own specification and provides a bracket with the kit to install it on most flat mount frames. Therefore, you will find that the included screws are M5 size, not M6. Additionally, this Ltwoo-specific specification was not initially designed to accommodate post mount frames, meaning it cannot be installed on any post mount frame.

As for the second question, it is actually easily solvable. Any Shimano hydraulic disc brake caliper compatible with mineral oil systems can be used with Ltwoo's control lever, including but not limited to models like MT200, M6100, R7170, GRX400, and so on.

You just need to ensure that the syringe, olive head, and hose are compatible. I recommend using BH90 components across the board because BH90 hoses can be directly installed on all BH59 compatible components. As long as you ensure proper hose installation, you don't have to worry about any compatibility issues.

I have paired my GR9 control lever with the UR300 flat mount caliper using BH90 hose, syringe, and olive head, and the braking performance and feel are excellent. I have been using it smoothly for nearly 5,000km without any issues of brake fluid leakage or loss of braking power. So, feel free to boldly pair them together.

Thank you so much. I came to that conclusion about the L-TWOO mount being oddball and none of the plates compatible with post mount. A shame the seller specifically told me that it was post mount only. I'm hoping that was a language issue not bad info. (I will be telling them)

Also great info on confirming compatibility. I found a pair of post-mount RS785 calipers that will mount without an adapter nearby for cheap so that should work. The BH90 recommendation is also quite helpful. The Shimano spec sheets seem to indicate both BH59 in some configs and BH90 in others and who knows what's best with the LTWOO levers.    So BH90 it is. I've heard the responsiveness is generally a bit better with 90s regardless of the design spec in Shimanoland anyway. Just have to wait for hose since none of my local shops have it in stock. (Who'd have thought the calipers would be easier than the hose?)

Thank you to the others on this thread for also and convincingly confirming the applicability of Shimano calipers.  I'll be back, hopefully with a success story and tips if all goes well.

[jonathanf2]

I had a problem getting the ER9 LTwoo calipers+140mm adapter plate to line-up properly using 140mm rotors on the rear. I tried it on 2 different framesets and both of them would not line-up properly. The strange part is that I had no issues running 160mm rotors with the Ltwoo calipers+adapter plate. I ended up switching over to ZRace XG calipers which required no adapter plate. I literally just unscrewed the Ltwoo calipers and screwed in the Zrace calipers, plug-n-play style. They work well enough with no issues on long descents.

[FabioZang]

I had a problem getting the ER9 LTwoo calipers+140mm adapter plate to line-up properly using 140mm rotors on the rear. I tried it on 2 different framesets and both of them would not line-up properly. The strange part is that I had no issues running 160mm rotors with the Ltwoo calipers+adapter plate. I ended up switching over to ZRace XG calipers which required no adapter plate. I literally just unscrewed the Ltwoo calipers and screwed in the Zrace calipers, plug-n-play style. They work well enough with no issues on long descents.

I have to say that I strongly discourage the use of this disc rotor. It completely neglects mechanical simulation and the bracket itself is prone to fracture. Furthermore, the pattern design is a mess, with hollow patterns distributed unevenly on several concentric circles. As a result, the friction rate of the entire disc rotor in the radial direction cannot achieve consistency, leading to the formation of grooves on your brake pads... It's a design that leaves me speechless.

The issues mentioned above are not exaggerated claims but rather highly probable events that have occurred multiple times on Chinese forums. I don't want anyone else to become a victim of this disc rotor.

[jonathanf2]

I have to say that I strongly discourage the use of this disc rotor. It completely neglects mechanical simulation and the bracket itself is prone to fracture. Furthermore, the pattern design is a mess, with hollow patterns distributed unevenly on several concentric circles. As a result, the friction rate of the entire disc rotor in the radial direction cannot achieve consistency, leading to the formation of grooves on your brake pads... It's a design that leaves me speechless.

The issues mentioned above are not exaggerated claims but rather highly probable events that have occurred multiple times on Chinese forums. I don't want anyone else to become a victim of this disc rotor.

I'll just flip the pads around to even them out. I rotate my bikes every other ride, so I'm not too worried!

[Serge_K]

I have to say that I strongly discourage the use of this disc rotor. It completely neglects mechanical simulation and the bracket itself is prone to fracture. Furthermore, the pattern design is a mess, with hollow patterns distributed unevenly on several concentric circles. As a result, the friction rate of the entire disc rotor in the radial direction cannot achieve consistency, leading to the formation of grooves on your brake pads... It's a design that leaves me speechless.

Lol those holes are the most retarded pattern imaginable, it's almost funny. imagine the donkey who came up with the design.

[jonathanf2]

Lol those holes are the most retarded pattern imaginable, it's almost funny. imagine the donkey who came up with the design.

They work fine! I double checked my gravel bike brake pads which does long descents on dirt trails and there are no deep track lines on the pads. My 2x160mm rotors are 1.6mm thick and feel quite sturdy. For someone to toast their rotors and dig tracks into their brake pads suggest to me they weighed like 130kg and had zero clue how to feather and modulate front/rear braking! There's a reason they have bigger rotors for bigger riders!

[Chiyou]

I found a pair of post-mount RS785 calipers that will mount without an adapter nearby for cheap so that should work.

Ha! I went through almost the exact same process as you did (head scratching, careful measuring, thoughts of drilling) a few months ago and ended up with an RS785 caliper as well (for some reason, my bike has one post mount and one flat mount). So far, the caliper is working well (as in, I haven't died yet). For the record, I am using eR9 and used a BH59 barb.

[Serge_K]

They work fine! I double checked my gravel bike brake pads which does long descents on dirt trails and there are no deep track lines on the pads. My 2x160mm rotors are 1.6mm thick and feel quite sturdy. For someone to toast their rotors and dig tracks into their brake pads suggest to me they weighed like 130kg and had zero clue how to feather and modulate front/rear braking! There's a reason they have bigger rotors for bigger riders!

A bad design is a bad design though. Glad it's working for you, but as a fat ass myself, i dont want half of my rotor surface to be air.

[rockerplates.de]

well, i think LTWOO tries not to hurt any shimano patents with this? i think paying for flatmount license would have been a good thing, i suppose shimano was not up to this..
We wil see, if ltwoo withstands a closer look of patent lawers