making non boost crank compatible with boost?

[A Potted Plant]

I have a m7000 crank(SLX), what do I need to do to use it with a boost frame?

 

[serviceguy]

I have a m7000 crank(SLX), what do I need to do to use it with a boost frame?

New cranks.

 

[Steve Vai]

Depends on the frame, but usually it's just a chainring.

 

[stb222]

I have a m7000 crank(SLX), what do I need to do to use it with a boost frame?

I used my older XTR crank on boost frame without doing anything than mess with the BB spacers.Now there a bunch of chainrings with different offsets to tweak chainline. Not, the chainrings move the chain my mm's, which is basically nothing.

 

[rick81721]

I have a m7000 crank(SLX), what do I need to do to use it with a boost frame?

 

[serviceguy]

The Shimano cranks are different for boost and not boost, not sure if the spider can be swapped out for a boost one, but since the chainring are bolted from the inside you can't add spacers to move he chain line to the outside. With Race Face direct mount (cinch) you would have just changed the chainring.

 

[stb222]

The Shimano cranks are different for boost and not boost, not sure if the spider can be swapped out for a boost one, but since the chainring are bolted from the inside you can't add spacers to move he chain line to the outside. With Race Face direct mount (cinch) you would have just changed the chainring.

That is only on the newer shimano cranks, however the main difference between the different widths of the newer cranks is the width of the axle of the crank. And yes, you can add spacers to move the crank out, it actually comes with spacers to do such.

 

[serviceguy]

That is only on the newer shimano cranks, however the main difference between the different widths of the newer cranks is the width of the axle of the crank. And yes, you can add spacers to move the crank out, it actually comes with spacers to do such.

I was looking at the M7000 series documentation, which is what the OP asked for. Different par numbers for boost and non boost. I don't know thisspecific crank, but where would you add spacers to make it boost if it wasn't?

 

[Steve Vai]

On the spindle or BB to move the whole crank over.

 

[stb222]

I was looking at the M7000 series documentation, which is what the OP asked for. Different par numbers for boost and non boost. I don't know thisspecific crank, but where would you add spacers to make it boost if it wasn't?
View attachment 108096

What @jimvreeland said, there is a spacer that fits the spindle and one that fits the bb cups. Both do the same thing.

 

[serviceguy]

You would need to move the crank 3mm out, does the Shimano axle allow you to do that?

 

[stb222]

You would need to move the crank 3mm out, does the Shimano axle allow you to do that?

Yes

 

[serviceguy]

Yes

That means you thread 3mm less into the non-drive side (or 6mm if you want to keep symmetry), in addition to up the Q-factor.

 

[stb222]

That means you thread 3mm less into the non-drive side (or 6mm if you want to keep symmetry), in addition to up the Q-factor.

Stop over thinking it, it is 3mm.

Most likely he already doesnt have symmetry. Not sure I have had a mtb crank have the same spacers on both sides, ever.

 

[jShort]

Stop over thinking it, it is 3mm.

Most likely he already doesnt have symmetry. Not sure I have had a mtb crank have the same spacers on both sides, ever.

Agree. With suspension designs and changing cranks and spindles between bikes, my stuff is all over the place.
On my race bike I just added a bunch of spacers to the NDS to fit a Stages PM. I can't tell a difference.

 

[serviceguy]

 

[stb222]

View attachment 108112

Shimano's own instructions dont show the same amount of spacers on each side...

 

[Sven Migot]

FWIW I run a non-boost SRAM BB on my Giant XTC with a 32t ring. The ring is super close to the frame but works fine. Don't think I could run a 34t tho.

 

[Steve Vai]

Boost is dead. Super Boost is the now!!

 

[Sven Migot]

I'm waiting for Mega Boost...