Groupset Hierarchy Explained

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A groupset is a pricing ladder with engineering attached. Shimano sells road groups from Claris up to Dura-Ace; SRAM sells from Apex up to RED. Every rung claims to be lighter, crisper and better made than the one below, and every rung costs more. The question that actually matters — how much lighter, how much better, and is that worth the money to you— is almost never answered with numbers, because answering it with numbers makes the upgrade look worse.

So here it is with numbers. Every figure on this page is Shimano’s or SRAM’s own published claim, read from their own spec databases and support documentation on 17 July 2026. We have not weighed anything. We didn’t need to — they publish it, and almost nobody quotes it.

Two findings up front, because they reframe everything below. First: climbing Shimano’s ladder from 105 to Ultegra to Dura-Ace buys you grams in the double digits, not the hundreds. Second, and more useful: Shimano publishes no weight at all for Tiagra, Sora or Claris rear derailleurs or cranksets. The spec sheet goes quiet exactly where the budget-conscious buyer needs it most. That silence is the most honest thing on this page, and we’ll come back to it.

The Shimano ladder, and what it actually costs in grams

Shimano’s road hierarchy runs Claris (8-speed), Sora (9), Tiagra (10 and 11), 105 (11 and 12), Ultegra (11 and 12) and Dura-Ace (12). The speed count is the first thing the tier buys you — and it’s the one that constrains your chain and cassette choices for as long as you own the bike.

Take the cleanest like-for-like comparison Shimano publishes: the 11-speed mechanical rear derailleur in short-cage form, same 30T maximum sprocket, same 35T total capacity. Shimano’s own spec table lists the Ultegra RD-R8000-SS at 200 g and the 105 RD-R7000-SS at 225 g. Twenty-five grams. The published difference in construction is that the Ultegra derailleur has sealed bearings in both the guide pulley and the tension pulley; the 105 spec table lists neither. Both use an aluminium bracket body and a GFRP plate body. Same materials, one bearing upgrade, 25 g.

Go up to 12-speed electronic and the gaps widen, because Dura-Ace starts spending real money on materials. Shimano publishes the Dura-Ace RD-R9250 at 215 g, the Ultegra RD-R8150 at 262 g and the 105 RD-R7150 at 302 g. That is 87 g from 105 to Dura-Ace on the rear derailleur — the largest single-component tier gap on this page, and still less than a small banana.

The cassette is where the ladder gets interesting

Cassettes are the one place the tier genuinely changes the material, and Shimano publishes it plainly. Compare the 12-speed cassettes at the same 11-34T ratio — the only ratio all three share:

Ultegra CS-R8101-12 at 345 g, 105 CS-R7101-12 at 361 g. Sixteen grams. What you’re buying for it, per Shimano’s table: the Ultegra cassette has two aluminium spider arms to the 105’s one, and an anodised aluminium lock ring where 105 uses nickel-plated steel. Both have twelve nickel-plated steel sprockets. The Ultegra is listed as HYPERGLIDE+; the 105 as HG.

Dura-Ace is the tier where the money shows up: CS-R9200-12 is published at 223 gat 11-30T against Ultegra’s 291 g at the same 11-30T. Sixty-eight grams from one cassette. That is the biggest genuine like-for-like saving on this page, and it is why, if you are actually chasing weight, the cassette is the component to attack first.

There is a second thing the Ultegra cassette buys that has nothing to do with weight: choice. Shimano lists the 12-speed Ultegra cassette in 11-30T and 11-34T. The 12-speed 105 cassette is listed in 11-34T only. If you want a tighter 11-30T block on 12-speed, the 105 tier does not offer one at all. That is a real functional constraint, and it is invisible if you only compare prices.

Where the published record stops — and why that's the story

Here is the finding that should change how you read every groupset comparison you have ever seen. In Shimano’s own rear derailleur spec table, Tiagra (RD-4700, RD-R4000), Sora (RD-R3000) and Claris (RD-R2000) carry no published average weight at all. The column is empty. The same is true in the crankset table for Tiagra’s FC-4700 and FC-R4000 and Sora’s FC-R3000.

So when a review tells you a Tiagra groupset weighs some specific number more than 105, that number did not come from Shimano. It came from someone’s scale, or from another publisher’s article, or from nowhere at all. We are not going to print it, because we cannot source it. Shimano does not publish weights below 105. If you want a like-for-like weight comparison between Tiagra and 105, the manufacturer has not given anyone the material to make one honestly.

What Shimano does publish for the lower tiers is materials, and it is more revealing than a weight would be. Ultegra and 105 derailleurs: aluminium bracket body, GFRP plate body, aluminium outer and inner plates. Tiagra RD-4700: aluminium plate body but steel outer and inner plates. Sora and Claris: resin plate body, steel plates. That is the ladder, described by the manufacturer, in the only terms it chose to describe it: aluminium and composite up top, steel and resin at the bottom. Steel is heavier than aluminium. You now know the direction without needing a number nobody published.

SRAM's ladder, and a comparison SRAM makes easy

SRAM’s own road page lists the hierarchy as RED AXS, Force AXS and Rival AXS, with RED XPLR, Force XPLR, Rival XPLR and Apex covering gravel. Where Shimano publishes component-by-component weights, SRAM does something more useful and rarer: it publishes whole-groupset weights, in its own support documentation, with the configuration stated.

And two of those figures are a genuine like-for-like. SRAM publishes the Force AXS groupset at 2,776 g“in a 2x Thread Mount power meter, 48/35 chainrings, and a 10-30 cassette configuration”, and the Rival AXS groupset at 2,993 g“in a 2x with power meter, 48/35 chainrings, and a 10-30 cassette configuration”. Same chainrings, same cassette, both with a power meter. 217 grams, for a full tier. We pull that comparison apart properly in SRAM Rival vs Force.

The RED figure needs a caveat, and it is the kind of caveat that usually gets dropped. SRAM publishes RED AXS at 2,496 g — but its stated configuration is “48/35T chainrings with power meter and 172.5mm crank arms, 10-28T cassette, 160mm rotors; including caliper mounting brackets and hardware, brake fluid, and all batteries”. That is a different cassette from the Force and Rival figures, and it explicitly counts rotors, fluid and batteries which the other two descriptions don’t mention. So RED at 2,496 g and Force at 2,776 g are not a clean 280 g comparison, and we’re not going to present them as one. SRAM’s own separate guidance is that RED eTap AXS weighs “about 300g less than Force eTap AXS” when comparing identical drivetrain configurations — which is the figure to use, and it comes with SRAM’s own hedge attached.

Apex is a different animal again. SRAM publishes Apex XPLR AXS at 2,890 g and Apex AXS with Eagle AXS at 3,181 g — but these are gravel drivetrain builds, not the 2x road configuration used for the Rival, Force and RED numbers. Apex XPLR at 2,890 g looks lighter than Rival at 2,993 g, and that comparison is meaningless because the builds aren’t the same thing. We mention it only so you don’t make the mistake yourself when you see the two numbers side by side.

Where the ladder stops being worth climbing

Add up the honest, like-for-like published gaps on the 12-speed Shimano side. Rear derailleur, 105 to Ultegra: 40 g. Cassette at 11-34T, 105 to Ultegra: 16 g. That is 56 g of published, comparable, manufacturer-stated difference across the two components where the tier is supposed to matter most. Fifty-six grams is a third of a full bidon.

This is where we’d normally be expected to say “but it feels sharper.” We can’t — we haven’t ridden them, and if a groupset’s case rests on somebody telling you it feels crisp, it has no case that survives contact with a spec sheet. What we can tell you is what the tier demonstrably buys:

105 to Ultegra buys pulley bearings, an aluminium lock ring, an extra spider arm, a cassette ratio you can’t otherwise get, and about 56 g. Whether that is worth it is a question about your money, not about engineering, and anyone who answers it for you without knowing your budget is guessing.

Ultegra to Dura-Ace buys 68 g on the cassette and 47 g on the rear derailleur — and, per Shimano’s crankset table, almost nothing on the crank: Dura-Ace FC-R9200 is published at 693 g and Ultegra FC-R8100 at 702 g, both at 46-36T and 170 mm. Nine grams. Dura-Ace is where diminishing returns stop diminishing politely and simply arrive.

Below 105, you are buying on materials and speed count, not on published weight — because there is no published weight. Steel plates and resin bodies instead of aluminium and composite; 8, 9 or 10 speeds instead of 11 or 12. Those are real differences. They are just not differences anyone has quantified for you.

One last piece of arithmetic that no groupset marketing will do for you: the published gap between the 105 and Ultegra 11-speed rear derailleurs is 25 g, and the 105 and Ultegra chains weigh exactly the same — 257 g apiece, per Shimano. If you want to spend money on grams, a lighter tyre or one less bottle cage will beat the entire tier upgrade, and cost a fraction of it. If you want to spend money on function, the honest answers are gear range and shifting reliability — and both of those you can address without moving up a rung at all.