I’ve two 4iiii’s too, and I’ve been happy with them. When I got my first, I tested against my hammer, and they were within the accuracy margins stated.
My 105 one clears my Topstone frame, but not the underside down tube bottle cage, so that had to go.
I’ve found another GRX option from Inpeak (thanks to the @GPLama channel) so that might help someone else.
In the grand scheme of things is having power from different brands an issue (Stages gen3 5800 on Bianchi and potentially Inpeak)?
Reassured by @GPLama 's report on the updated firmware for the Inpeak, mine arrived yesterday (£330 from SigmaSports with a £25 discount). Really nice looking bit of kit although the packaging is pretty spartan (but very easily recyclable which is great), app seems good and no issues pairing to Edge 1030 Plus. Hoping to trial for the first time tomorrow and ride with existing Assioma Duo at the weekend to compare data readout. The much discussed Assioma hack worked fine for a while but I’m in the lucky position that I could get the Inpeak at a competitive price and not worry about damaging the now out of warranty Assioma Duos. My fingers are crossed to get some cyclocross this autumn/winter and will be nice to have the crank based power meter for that. Whether I ride road, gravel, MTB or trainer depends on the weather and my mood so seemed like a good investment and avoid the rebuilding of pedals as well as the replacing pedals.
I just got the 2021 Checkpoint SL5 and am awaiting a 4iiii left side GRX PM. Did you wind up getting a L side and did it fit ok?
I would think it would be fine. I think the grx has a wider q factor but not positive. I have a 4iiii on my domane and there are no issues.
A month or so ago, I went to Trek shop and put a Stages left-side crank arm on a 2021 Checkpoint. Did not fit. The 4iiii is similar so I would check with 4iiii and/or use their sizing template thingy (printable? I don’t remember).
Nice photo!
Same here.
I have a GRX 810 crankset on a SL5. Stages Gen-3 Left crank wasn’t close enough to even consider shims. The 4iiii Podium was supposed to be a little thinner but is either out of stock perpetually or discontinued.
I ended up going going with a right-side factory install from 4iiii. I’ve been very happy with it.
hi, very helpful indeed.
I have a cyclocross frame which originally came with a 105 5700 but I had a GRX 600 set installed.
So obviously my frame can take a 105 crank.
now I am asking myself: installing a leftside 105 4iii crank should not be an issue, is that correct?
And what about Q-Factor? What dies the difference mean in reality? I had a bike fit done and the setup is perfect, no knee pain. Would the new QF change the setup considerably?
The GRX 4iii is almost double the price of a 105 version.
thank you
I have a quarq dzero on my gravel bike. That is spot on.
I’ve got the 4iii GRX on my gravel bike - its fire and forget, I love it. I’ve Powertap pedals on my road bike - and they are great for switching between summer and road. Got it ‘cheap’ from these folk
I run a 4iiii 105 crank on my GRX - a spacer was needed to move it out a little to avoid catching the frame but works great and far cheaper than the GRX version
thx, do I get it right: you have a GRX 600 (?) setup, but have changed the left GRX crank with a 4iii 105 crank? right?
I’ve GRX 800 but all it’s the same logic as 600. But yes swapped left crank for the 4iiii 105 and added a small spacer to push it out slightly to keep the Q factor (purely to avoid frame rub)
excellent, thanks!
I put a left sided Ultegra crank w/ 4iiii PM. Works fine. Got it from this guy, easy to work with, quick service: https://speedvisionbikes.com/
ok, i ordered the 4iii left crank 105 version… 200€. quite ok i guess. I hope it fits. Thank you for the support.
Yes, the 4iiii 105 crank will replace the GRX crank just fine. BUT before you order make sure that the attached power meter will clear the chain stay. The 4iiii website has a little printable template to check. If I recall you put a AAA battery between current crank and chain stay . If it fits you’re good to go. Good luck!
thx - my cadence sensor sits right there and seems to be plenty of space left. will see.
Your reply reminded me of a little tweak to my setup. I still use the old Wahoo Speed/Cadence sensor that rubberbands to the left crankstay. It can be moved back or forward a bit. The power meter that comes attached to the crank is permanently glued to it and not adjustable. I think I had to move the S/C sensor back a bit on the chainstay to it wouldn’t interfere with little power meter pod. When that was out of the way, it was also out of reach of the magnet enclosed in rubber that goes on the crank. I solved that by getting a little disk magnet about the diameter of the pedal spindle. Way stronger than the original Wahoo magnet, and allowed me to move the whole S/C sensor back.
