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microSHIFT M21 RD-M21SS rear derailleur, 7-speed, short cage (SS)

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9.99 
RRP 12.99 
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Delivery method on Wednesday 17.06.2026
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Delivery method on Wednesday 17.06.2026
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4,7/5
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microSHIFT M21 RD-M21SS derailleur

microShift M21 is the basic range of mountain derailleurs. The kinematics of this range work like more expensive derailleurs from the microShift brand and deliver light and precise shifting in an attainable package. Compatible with Shimano drives.
Product details
Groupset Other
Gears 1x7, 2x7, 3x7
Cage type Short strap
Max teeth 28-30T
Min teeth 13-14T
Capacity 21T
Body material steel/composite
product ID 143460
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Perfect for children, 100 times better than Tourney, as it is much easier to advise. And the shifting with Shimano is fine, so I highly recommend it - if the crank is too weak for shifting, don't buy a different gear like I did (I tried three), but replace the derailleur with this one. It goes beautifully and smoothly.

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In my opinion, a better derailleur than the cheap Shimano Tourney. This one has better control over the distance between the derailleur pulley and the cassette (multi-wheel).

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She rode a children's bike. It seems to me that I have a bigger friend, but I like it exactly and for that price... Krpec has already put the bike right on top of her a few times and she has held on.

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The renovation of the children's bike went well and smoothly thanks to this derailleur

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It's mounted on a child's bike. It serves its purpose, for the money there's nothing to complain about.

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Used on a children's bike, no problems, goes easily

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cheapest derailleur

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Perfectly sufficient for an older bike, likes it nicely and without problems

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It works, it's enough for a bike to work.

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SK Dobrý deň, bude táto prehadzovacka fungovať aj na 5sp kazete s 5sp radenim? Pripadne aká iná je vhodná? Dakujem

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SK Dobry den,

5-rychlostne viackoliecka su uz zial velmi nestandardne, aktualne vhodnu prehadzovacku v ponuke nemame
Da sa pouzit aj 6/7-rychlostny salter, avsak spacing medzi pastorkami je pri 5-rychlostnych viackolieckach o nieco vacsi, nastavenie prehadzovacky tak moz ebyt problematicke, resp. nemusi radit presne a rychlo v celom rozsahu kazety/viackoliecka.

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This Taiwanese brand mircoSHIFT has been making components since 1999. Even though they are not very popular on the bike market, their reputation in the cycling industry is excellent. They offer shifters, rear and front derailleurs and cassettes. Myna global manufacturers use their components.

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