I'm a hobbyist bicycler, soon to turn 77 years old. Been bicycling again since 2023, acquired some new-tech bikes since I started back with it.

I like gadgets (don't we all?) and power meters ought to fit this label pretty well I trust. I've got a 4iiii left crank for one bike now, proves to be a reliable data-deliverer.

Still, the potential appeal of a pair has me yearning for answers. 4iiii's are more than I want to spend (now that I own a single) so pedals are my next choice.

They're all rather spendy aren't they? Least costly are the Assioma Duos, that appear to look of similar design to the (dumb?) Shimano PD-R7000's I just bought.

Anyone venture an opinion or have first-hand input they'll share as to whether Assioma Duo's will work safely with these PD-7000's cleats? I have to assume Assioma Duo's come with their own cleats, but as I have yet to use the Shimanos I might just return them for credit before then.

Don't cleats come with the pedals? Or are you looking at a used set?

I'm sure cleats come with 'em, yeah.

Problem being I just received a pair of PD-R7000's. If the Assiomas can use the Shimano cleats I could have a pair of Assiomas on one bike and a pair of Shimano's on another bike & not have to changes shoes / cleats between bikes.

Or I can return the Shimano's as they're as yet unused get some $$$ back.

Using the left-side-only 4iiii has proven worthwhile, why I want to explore dual meter pedals. 4iiii doesn't offer a right side retro-fit for non-PM cranks.

4iiii will install a right side PM on your Ultegra or Dura-Ace crank. Or is your crank something else? Most all their left side PM's that I'm aware of will work with an added right side 4iiii PM to give you a dual sided PM.

While tariffs could be issue since they are in Canada. A header at the top of their page suggests they are priced currently with them covering the tariff and brokering fees. So maybe that makes their prices look higher compared to others selling from outside the US that are leaving those fees and tariffs to the importer of record. Though if you are pricing from a US based vendor, then the Assioma's have already had their tariff and fees paid.

My 4iiii's on the Tarmac, Shimano 105. Shimano Cues on my Diverge. I don't ride my Motobecane much anymore but for commuting and then it's not for longish rides. It's fitted with a Stronglight 93 triple in it's current iteration.

Last time I checked 4iiii wasn't doing retrofits. That may have changed since, I'll check that out.

Still, having a pair of pedals I can swap between bikes is an attractive aspect.

Bouncing this topic off Google tells me "The Assioma Pro RS and DUO-Shi models are designed specifically for Shimano SPD-SL cleats, while the original Assioma Duo/Uno use Look Keo cleats."

AND that I can slip Shimano R7000 pedals onto Assioma spindles. Seems there's more out there I need to look into....

Word of caution regarding the Duo-Shi pedal spindles, I've essentially worn out the spindles in a couple of seasons. The spindles are supposedly hardened steel, but mine sure don't seem that hard. Most of the load from the pedal body is transmitted to the spindle via a bushing. The bushings eventually wear out and are part of a rebuild kit. After a couple rebuilds, the spindles became significantly worn enough to introduce play. I'm still using them, but they've since been taken off my main road bike and to a lesser-ridden bike.

I am a high-mileage rider, so YMMV vary with the longevity of these pedals. So far in my experience with power meter pedals, I've been 0/2 for a long term solution. The other pedals I've used are Garmin Rally XC pedals on my gravel bike, which are pretty crappy IMO. Nowadays, I stick with spider or crank-arm based power meters. I've had multiple 4iiii power meters across various bikes, only 1 issue with power drops and they replaced it no questions asked. 4iiii did a dual-power meter retrofit on the DA9200 crank arms on my main road bike, so they will do a retrofit.

Their Pro RS model is for Shimano cleats and their other road pedals are Look.

Sierra_rider is fking heroic and I would love to come back and tell you I've worn out the spindles!!

If I may, how long / estimated miles have you been using yours?

My guess is that your habits are more towards the side of the spectrum I occupy... no heroic here!

They offer that combo, sadly not (yet?) for the lower price point R7100 I have.

The Assioma Duo pedals are for Look KEO cleats.
I've been using the Uno pedals for several years now and they have proven to be a great and accurate pedal. I have around 30k miles on them and never a problem...well other than forgetting to charge them now and then lol.
The Duo pedals are on sale at Favero for $500US including free shipping. I'm probably going to get a pair. Their new Pro RL/RS pedals are very nice and have high reviews from Lama and Rainnmaker but I don't want to spend $800 which is still tons less cost than Garmin's...yikes

Thanks for this!

Shipped from Italy, I'm seeing current import tariff quoted at around US $27 so not too bad a price bump.

Three days. For my classic steel bike and the test ride shows the power data is very comparable to the 4iiii on my CF. Single sided.

Good to know!

I need to list my two 4iiii-equipped Shimano 105 NDS cranks for sale now; one's a 172.5, other's a 170. They've proven their worth, why I want to move to something I can mount on either of my three bikes.

Meh, that Sierra Rider guy is over-hyped!

In all seriousness though, the Pro RS and MX are compelling products IMO. I guess they use decently-sized bearings, just like any old Shimano pedal, so it should be good from a longevity standpoint. If I didn't have all my power meter needs sorted out, I would seriously consider the Pros.

I bought some of the Pro MX pedals earlier this year and have maybe 500 miles on them. Being able to easily switch between bikes was well worth it to me. I only ponied up for the single sided but would happily consider an upgrade to the right side once the dust settles from some other recent bike related purchases. Set up was so simple and the pedal has always reliably fed info to my computer.

As I understand with the Pro line you can swap on pedal bodies for whatever your cleat compatibility preference (Shimano Road, MTB, Look) in a few moments.

The Pro line is quite a bit spendier than the standard Assioma, but I’d give them a hard look if I were you.

I replaced the bearings on my first pair of Duos recently and they didn’t have bushings as a spindle interface. 3 bearings on each pedal. Maybe the SHI version are different?

Sounds like they are different then. Only one bearing on the SHI and it's a small one at the end of the spindle, that pretty much just locates/secures the bushing. The pedal body then threads onto the bushing. Even with the small bearing, it develops some axial movement within the bushing, which introduces a bunch of play into the pedal(separate from the worn spindle play.) I remedied this by using a retaining compound to account for the oversized bearing pocket of the bushing.

The bushing, with the small bearing at the end:



Not my picture, just one I found on line...but this is pretty much what my spindles look like after a couple seasons:

I'm curious about this...what is your weight and riding style?...if you are a clydesdale and a low rpm pedal stomper this is perhaps the reason for faster wear...i'm using the 'unos' and have for the past few years and there is no wear at all but i'm only 145lbs and a 'spinner'...

170lbs and a high cadence rider.

I'm a heavy, low cadence grinder. Mainly ride on the trainer (Zwift, TPV) though. I have somewhere between 30 and 35k km on them and haven't had an issue with play. Honestly, I might take them off that bike. Not that there's anything wrong with them, but I am not currently strong enough that I need to dual record and it seems like a waste to put wear on them when I could get some Look Keos to use instead and save them for outdoor rides or if I actually get strong enough to need to dual record (when I bought them, my 20-minute power was creeping into the 360's and a 375 W 20 minute without dual record is an automatic DQ in the races I do; I have only broken 350 once in the last year or 2 though).

wow...light/ish and a spinner...axles shouldn't wear like that...
have you contacted Favero???

I've thought about a power meter of some sort but I suspect I won't get one. Do you find it gives you interesting data? I like data. But I'm told that heart rate correlates roughly with power so I think I'm happy. There's not much sense in comparing my power with others' power, just comparing myself from one day to the next. Thoughts?

As I understand, one could totally get away with using heart rate alone to estimate how much gas might be left in the tank later in the ride.

Last fall I decided to get serious-ish about racing. Kind of a fun challenge to see what my body is capable of at 45. Power data has been pretty important to the way I’ve been tackling things. I’m comparing it to the data I get from regular testing on the trainer to find out what kind of wattage I can hold for different periods of time. Wattage output is my primary metric on a ride, but really only one piece of the story for assessing my overall intensity load and capabilities.

Needed by everyone? Nope. Fun to look at even if you’re not dialing in specific aspects of fitness? Heck yes! Essential if you have aspirations for like a B group podium spot? Maybe, probably not, but certainly helpful. I’m especially excited to see what I can crank out at the end of a cyclocross race where the whole shebang is pretty short but I’m gunning hard for pretty much the whole 45min to an hour.

As for pedals vs cranks, I love that I can pop these pedals off my contemporary gravel bike with a bunch of carbon fiber junk over to the Stronglight cranks on my old Follis if I want to ride that around for a long zone 2 endurance training ride.

Thanks for your response. If you're racing at any level, a power makes at least a little sense, possibly more. It would be fun for me but it would also a lot of complication of setup and maintenance that I'm not up for, not to mention expense. I have an apple watch which measures heart rate unreliably on the bike but oh well. I'm not putting more money or work into it.

Most riders use their power data just like they used to use their HR data. If you do that, you shouldn't be surprised if your results using power aren't too different from your results using HR.

There are things you can do with power data you can't do with HR data but not many riders do them.