I’ve got a Blur LT but it has no ISCG mounting holes.

I know I can get adapters that go between the bottom bracket and frame (instead of a spacer) but will this work on my bike?

My BB is a square taper to go with my Middleburn cranks.

thinking of one like this

Thick thin + clutch works better than a chain device.

Or downtube mounted if you must.

I’ve got a Superstar BB to ISCG05 adapter you can have for cost of postage. will pop pic up later.

If you’re set on running a guide. I have one of those sat around.

How are those adapters held in place? Just clamped between the frame and BB? Do they not twist in use?

http://bionicon.com/cguide

Adapter won’t work with a square taper BB

How many chainrings have you up front? If it’s one, then narrow/wide chainring will sort you.

Blackspire Stinger can be BB mounted.

Do they not twist in use?

Yes.

Surely something like this would be a better bet then…

http://www.burgtec.co.uk/news/csixx-iscg-adaptor/

Coolhandluke, check out my Raceface Atlas FR BB mounted one, works really well as i had it on an intense full sus.