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TRiPEAK Jetstream Pro Offset Oversize Pulleys fit Standard Cages

tripeak jetstream oversize derailleur pulley with offset axle
23 Comments

Want to try oversize derailleur pulleys but aren’t ready to disassemble your entire part to swap the cage? The new TRiPEAK Jetstream Pro OSPW kit fits a massive 18-tooth lower pulley into your stock derailleur by using a clever offset axle design.

The pulleys use a machined aluminum hub with a composite toothed idler wheel spinning around it on ceramic bearings. This asymmetric design pushes the pulley forward and up to make room for its larger diameter, letting you get the benefits of a larger pulley without having to severely modify your derailleur.

tripeak jetstream oversize derailleur pulley with offset axle

The larger wheel means shallower chain angles for less wear and friction, and their ceramic bearings spin extremely freely, but…

tripeak jetstream oversize derailleur pulley with offset axle

…it ships with dry bearings, so you’ll love the way they spin out of the box. However, the kit includes a small bottle of light viscosity bearing lube that you’ll need to apply before installing them, and then clean and check them periodically.

tripeak jetstream oversize derailleur pulley with offset axle

The hub has a keyed design to lodge itself into the pulley cage, preventing the center part from spinning inside the cage. Depending on the model, that key might be on the inner or outer side of the cage. And, different models have various tooth profiles – standard or narrow/wide.

tripeak jetstream oversize derailleur pulley with offset axle

Options for most modern 11- and 12-speed SRAM and Shimano derailleurs (road, gravel, mountain bike) are offered in a wide variety of colors.

tripeak jetstream oversize derailleur pulley with offset axle
tripeak jetstream oversize derailleur pulley with offset axle

MSRP is $180 for the kit, which includes a standard-sized upper jockey wheel, also with ceramic bearings, and a 4-year warranty.

TriPeakBearing.com

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23 Comments
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blahblahblah
blahblahblah
1 month ago

nice

Fergus
Fergus
1 month ago

Oh for christ sake, this is depressingly poor engineering. The chain angle increases as the chain goes from one pully to the next , not decreases.

Tim
Tim
1 month ago
Reply to  Fergus

Maybe it’s about sales, not engineering?

A. Rearte
A. Rearte
1 month ago
Reply to  Fergus

I’m not sure i understand your argument, but the angle they are talking about is the angle the links rotate while wrapping around a larger pully diameter (as diameter increases, the angle converges to zero.

But anyways… from the idea of optimizing pully geometry in engineering to all these wild pully and cage products for road cycling, the ideas and reasons really got lost .

JoeS
JoeS
1 month ago
Reply to  A. Rearte

They’ve got to keep selling goofballs on the idea if they just buy the latest $700 pulley gadget or ceramic bearing their 18 mph Fred speed will increase to 18.00012 mph.

Veloaficionado
Veloaficionado
1 month ago
Reply to  A. Rearte

@ Fergus it looks like the tension pulley is positioned low enough and forward enough so that the angles of the chain as it goes over the guide pulley and onto the tension pulley aren’t significantly increased. But is $180 too much to pay for a couple of watts saving, when a proper clean and immersion wax treatment (less than $5 per wax, and depreciating all the time, as you pay off the equipment and amortise the wax supply) can save you up to 10W?

Bumscag
Bumscag
1 month ago
Reply to  Fergus

LOL, you’re literally the opposite of correct. The chain angle between pulleys doesn’t matter. It’s the amount each link articulates as it wraps onto and off the pulley that creates friction and drag.

Honestly, I kinda love it when people say things that are hilariously wrong with absolute conviction on the internet.

Veloaficionado
Veloaficionado
1 month ago
Reply to  Bumscag

He’s sort of right. If the tension pulley was centred on the screw he would be right. But if you analyse the angles of the chain as it goes off the guide pulley, and onto the below/before-centre tension pulley, you’ll see that they’re not significantly different to a stock setup. Don’t be so freaking self-righteously scathing: I’m sure that you’ll say something boneheadedly stupid at some stage, and will get sore when someone scathes at you about it.

raull d
raull d
1 month ago
Reply to  Fergus

The center of the lower pulley moves forward and I would guess the tangent at which the chain meets the lower pulley would be about the same as stock. Meanwhile the chain needs to articulate less to wrap around the lower pulley. Neat idea.

I bet the big advantage most riders get out of these aftermarket pulley schemes is that their big $$$ outlays cause them to maintain and clean their pulleys better and thereby save more watts over the old stock pulleys that they probably never broke down and cleaned (or replaced).

Mike
Mike
1 month ago

What’s the point in making derailleur pulleys’ teeth narrow-wide? They don’t need any chain retention and it makes cleaning them so much more annoying…

Bumscag
Bumscag
1 month ago
Reply to  Mike

It would seem there’s less benefit for the lower pulley. But the upper pulley effects shifting so there’s probably some benefit to going narrow-wide or SRAM wouldn’t be all-in on it?

JoeS
JoeS
1 month ago
Reply to  Bumscag

LOL

Mike
Mike
1 month ago
Reply to  Bumscag

Except one detail – the upper pulley is normal… Basically – it’s dumb,

Bumscag
Bumscag
1 month ago
Reply to  Mike

Except SRAM upper pulleys *are* narrow wide (at least on their MTB mechs). Why these goobers did it this way is a mystery.

blablabla
blablabla
1 month ago
Reply to  Bumscag

Oh yeah, You’re right, forgot about the T-types… Still doesn’t change the fact – useless, dumb and annoying.

Grillis
Grillis
1 month ago

MSRP $180?
They’re on Amazon for $160.

Yeah sure
Yeah sure
1 month ago

Fancy derailleur jockey wheels have always been the cycling version of the emperor’s new clothes. I root for these companies though, it always great to watch rich delusional people get ripped off. Victimless crime imho.

JoeS
JoeS
1 month ago
Reply to  Yeah sure

How true indeed. LOL

CeeBee
CeeBee
1 month ago

If these were like $50 I’d get one just for aesthetic purposes. 180 is kinda crazy tho…

TypeVertigo
1 month ago

Oversize pulley wheels are not for me, personally, but the offset axle design and the way they’re meant to stick themselves into the holes on the cage – it’s all pretty clever.

M.m.
M.m.
1 month ago

If this pulley wheel were to run for an eternity, all that would be probably left is the bearings or dust.

FritzP
FritzP
1 month ago

Aren’t the large diameter bearings used in the lower pulley higher drag than a small diameter bearing? There was discussion about this when Absolute Black came out with their widely panned ceramic bearing pulley upgrade.

Greg
Greg
1 month ago
Reply to  FritzP

Yup. Higher ball speed, faster seal movement too. For such a lightly loaded part, you’d want the smallest axle and inner race.

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