Tool Time

[Dee Hubbs]

Swapped a GRX 820 group onto my gravel bike this weekend. Discovered that
1) Shimano doesn't include a bleed block with the brakes (retail packaging...not a j-kit)
2) none of the leftover bleed blocks I have from MTB brakes will fit
3) the bleed cup I've been using for years on MTB brakes doesn't fit on the GRX levers
WTF Shimano? Anyone have a bleed kit they like that will include a GRX compatible bleed block and cup?

The bleed block you need is Shimano Y8N219000, the most square looking one with a vertical slot cut into it. It retails for $3.00


The levers are part of the road family, So the Road Bleed Cup uses a m7 thread, and the MTB cup uses a m5 bleed cup.
If your cup is in good shape (not striped out plastic threads) you can but a $4 adapter to screw into the MTB m5 cup and will threads into the m7 road lever.
Either Y0C698050 or Y8NG12000

These are also $3.00
Or buy a specific funnel, a new road funnel is $19.00
And if you want a Shimano Kit with both funnels, all the bleed blocks and a syringe with a fitting for the bleep nipple its called
"Shimano Professional Disc Brake Bleed Kit" and it retails for $66.00. This kit is worth it just for the fitting that attaches to the bleed nipple.

[John_B]

The bleed block you need is Shimano Y8N219000, the most square looking one with a vertical slot cut into it. It retails for $3.00


The levers are part of the road family, So the Road Bleed Cup uses a m7 thread, and the MTB cup uses a m5 bleed cup.
If your cup is in good shape (not striped out plastic threads) you can but a $4 adapter to screw into the MTB m5 cup and will threads into the m7 road lever.
Either Y0C698050 or Y8NG12000

These are also $3.00
Or buy a specific funnel, a new road funnel is $19.00
And if you want a Shimano Kit with both funnels, all the bleed blocks and a syringe with a fitting for the bleep nipple its called
"Shimano Professional Disc Brake Bleed Kit" and it retails for $66.00. This kit is worth it just for the fitting that attaches to the bleed nipple.

If anyone is in the hunt for just the bleed nipple fitting this can be purchased from Park Tool separately from the full bleed kit for $13 and another $13 for a syringe.

It can be found in the spare parts section and works a good bit better than the friction fit hose.

[jm2e]

Proving once again there’s better information here than anywhere else on the interwebz.
Yea I could google it, but why?


Sent from my iPhone using TGR Forums

[EWG]

I need a new pair of calipers. Don’t wanna spend $150 on Mitutoyo LED electronic ones.

Why shouldn’t I just buy some Mitutoyo verniers?

What do we think for $50ish calipers these days?

[Eluder]

I need a new pair of calipers. Don’t wanna spend $150 on Mitutoyo LED electronic ones.

Why shouldn’t I just buy some Mitutoyo verniers?

What do we think for $50ish calipers these days?

It really depends on what you are doing with them, of course, but the run of the General Caliper has served me well enough for bike-related needs.

[adrenalated]

I need a new pair of calipers. Don’t wanna spend $150 on Mitutoyo LED electronic ones.

Why shouldn’t I just buy some Mitutoyo verniers?

What do we think for $50ish calipers these days?

https://taytools.com/products/igagin...39269059526743

Stated accuracy is +/-0.0010 per 4", compared to +/-0.0008 per 8" for Mitutoyo.
If you are not a machinist, that should be just fine.
I don't own these, but probably would buy them if I was currently in the market.

[MCS5280]

[...]
The levers are part of the road family, So the Road Bleed Cup uses a m7 thread, and the MTB cup uses a m5 bleed cup.
[...]

Thanks! Baffles my mind that Shimano went from M5 to M7 on road.

[grskier]

Thanks! Baffles my mind that Shimano went from M5 to M7 on road.

Is there a significant volume differential? I wonder if the smaller port would make it harder to work with smaller volume?

[Dee Hubbs]

Thanks! Baffles my mind that Shimano went from M5 to M7 on road.

'
MTB lever bodies are made from a metal/alloy and can withstand smaller threads,.
Road levers are all plastic/composite. The road lever bleed ports are so easy to strip out, so a larger thread was engineered to account for the weaker threads in the body material.

As your local shop for a bleed block and for the adapter. These pieces come in hundreds of boxes they install, so they should have a drawer full of them.