GRX 46/30 Cranks on 2019 ScottAddict 20 ?

[cyclotaur]

Hi all, currently running compact road 50/34 into a Sram 11-36 cassette on my ScottAddict but would really like a lower bottom gear.

Could I just bung a GRX FD and 46/30 crankset on there ?
Cheers,
Mike

[warthog1]

Or a 48/31 grx chainset so you lose less top end.
I assume it will work but don't know for sure sorry.

[cyclotaur]

Or a 48/31 grx chainset so you lose less top end.
I assume it will work but don't know for sure sorry.

Top end not a problem, trust me !

[caneye]

Check the width of the GRX crankset to make sure it doesn't mess around with your current front derailleur.

https://www.ridecx.com/blogs/learn/unde ... -cranksets

[cyclotaur]

Check the width of the GRX crankset to make sure it doesn't mess around with your current front derailleur.

https://www.ridecx.com/blogs/learn/unde ... -cranksets

Good article. This is why I mentioned GRX cranks AND front derailleur.

[Duck!]

GRX is just slightly modified road gear, and mostly interchangeable. Biggest difference is in the front chainline; GRX places the chainrings a bit further outboard to accommodate wider chainstays dictated by wider tyres, therefore has a wider-stanced FD to match. You could possibly tweak the road FD's limits to swing it out that bit further, but it's safer to get crank & FD as a pair. They will play fine with the rest of the system.

[LateStarter]

Hi all, currently running compact road 50/34 into a Sram 11-36 cassette on my ScottAddict but would really like a lower bottom gear.

Could I just bung a GRX FD and 46/30 crankset on there ?
Cheers,
Mike

Is this currently 10 or 11sp? currently have triple cranks (24-36-48) &12-36 rear, currently 9sp but has been 10 changing only the right level (Sora for 9, ultegra for 10). It also used to be 2x10 (46-30, both levers ultegra & FD). I might go back to a 46-30 with a GRX (10sp) but really then want a bigger cassette, 11-42 would be really nice but don't know if the ultegra levers would still do the job? Want to change as little as possible.

[cyclotaur]

GRX is just slightly modified road gear, and mostly interchangeable. Biggest difference is in the front chainline; GRX places the chainrings a bit further outboard to accommodate wider chainstays dictated by wider tyres, therefore has a wider-stanced FD to match. You could possibly tweak the road FD's limits to swing it out that bit further, but it's safer to get crank & FD as a pair. They will play fine with the rest of the system.

Thanks Duck that's the answer I was looking for.

[Duck!]

......currently have triple cranks (24-36-48) &12-36 rear, currently 9sp but has been 10 changing only the right level (Sora for 9, ultegra for 10). It also used to be 2x10 (46-30, both levers ultegra & FD). I might go back to a 46-30 with a GRX (10sp) but really then want a bigger cassette, 11-42 would be really nice but don't know if the ultegra levers would still do the job? Want to change as little as possible.

GRX, even in 10-sp. form is based on 11-sp. architecture which has a different cable stroke which is incompatible with most other 10-sp. shifters. You'll need a GRX400 or 4700 Tiagra shifter to work. Although the derailleur can fit a 11-42 cassette, it won't do it paired to a 16T chainring difference, it doesn't have the length to take up the chain slack. Maximum possible chainring difference is 14T. Or if you really wanted tthe 46-30, your maximum cassette is 11-40.