Max spacer stack height?

General rule is 3-4cm for carbon steerer. I read that somewhere maybe it was on this forum.

http://www.competitivecyclist.com/za/CCY?PAGE=FAQS#ques_28

"Given that most of the forks we sell have carbon fiber steerer tubes, we are restricted by industry standards to a limited 'stack height' of spacers. We can only stack a steerer tube as high as it is wide. In other words, for a 1" fork, we are permitted to stack the fork with 2.5cm of spacers. For a 1-1/8" fork, we can stack it 3.0cm."

varies by manufacturer

It varies by manufacturer. My True Temper Alpha Q Pro is 55mm.

flip the stem???

Although most steerers will work fine with 4cm of spacer, if you need that much, you'll get a more rigid setup with 2cm of spacer and the stem in the 96 degree position (instead of 84). If you need both, that's OK too, but I'd work on tolerating a lower bar or get a longer headt tube on the next frame.

FWIW, LOOK frames come with a 15mm extended top on the headset and 3cm of spacer.

C-40...

C-40 said:

Although most steerers will work fine with 4cm of spacer, if you need that much, you'll get a more rigid setup with 2cm of spacer and the stem in the 96 degree position (instead of 84). If you need both, that's OK too, but I'd work on tolerating a lower bar or get a longer headt tube on the next frame.

FWIW, LOOK frames come with a 15mm extended top on the headset and 3cm of spacer.

Click to expand...

I'll first work at tolerating the bar. My concern arose from back pain from this last weekend's ride. Fact is, I had a pretty significant chiropractic adjustment on Friday and then rode pretty hard on both Saturday and Sunday (after being off the bike for over a week). I have a bit of osteoarthritis in my middle back and was feeling pretty gimped after. More regular time on the bike before futzing with my fitter's good work is probably wise.