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⚡ Never lose your chain, no matter the ride!
The XLC CR-A03 Kettenspanner is a high-quality aluminium chain tensioner designed specifically for single-speed bicycle hubs. Featuring 16-20 teeth and a 32mm roller diameter, it ensures optimal chain tension and stability, even during aggressive riding like pump tracks and jumps. Lightweight at 0.12 kg and easy to install at the derailleur hanger, it supports up to 250 pounds load capacity and comes with a 2-year manufacturer warranty, making it a reliable upgrade for serious cyclists.




| ASIN | B002NNEQOI |
| Best Sellers Rank | 113,172 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 270 in Cycling Chains |
| Brand | XLC |
| Country Of Origin | Taiwan |
| Customer Reviews | 4.2 out of 5 stars 478 Reviews |
| Global Trade Identification Number | 04032191731742 |
| Included Components | XLC Chain Tensioner |
| Item Length | 136 Millimetres |
| Item Type Name | Chain Tensioner |
| Item Weight | 0.12 Kilograms |
| Item length | 136 Millimetres |
| Load Capacity | 2.5E+2 Pounds |
| Load capacity | 2.5E+2 Pounds |
| Manufacturer | XLC |
| Manufacturer Part Number | 2501106000 |
| Material | Aluminium |
| Model Number | 2501106000 |
| Product Warranty | 2 year manufacturer |
| Recommended Uses For Product | Maintaining single-speed bicycles, Repairing single-speed bicycle drivetrains |
| Recommended uses for product | Maintaining single-speed bicycles, Repairing single-speed bicycle drivetrains |
| Roller Diameter | 32 Millimeters |
| Roller diameter | 32 Millimeters |
| Strand Type | Einfach |
M**E
Chain stays on even on massive jumps
My son is extremely happy that his chain now never accidentally comes off. He does a lot of pump tracks with big jumps etc. This tensioner does the job and was not expensive.
T**N
Great quality
Bought after a cheaper off-brand one broke. This feels 10x more sturdy. Strong spring also.
M**E
Arrived promptly and in perfect condition. Good price.
I bought it to allow maintenance of chain tension on a hub geared bike without moving the hub in the dropouts. Seems to work pretty well. It is not ideal for this function because the lateral adjustment is at it’s absolute inmost limit. I think it’s designed to allow a multi sprocketed bike to be used as single speed. For my purposes it would be better if the main arm slanted inwards to naturally align the tensioning jockey wheel with the sprocket of the gear. Despite this I am very happy to use it on my bike and won’t change it unless I discover a better alternative.
W**N
Good buy
Does the job , haven't had any problems with it , good quality for the price
E**M
Useful component but needed a bit of adjusting to get right chainline
Solid component that works well in tensioning the chain of a single speed (freewheel) bike. Using a flip-flop wheel in a traditional roadbike however doesn't leave much margin for error and careful adjustment is required as there is a limit on the outward position of the small sprocket arm. Equally adjusting in the other direction can clause the arm to snag the wheel spokes. All that said, if you take care and spend time on adjusting you can probably run a snag-free, straight chain line.
O**S
Did the job
Did the job and kept good tension on chain
M**P
tensioner wheel
Good part in general but the tensional wheel loosens off and falls off when pedal
A**R
My son pleased with it!!
Fits great!! N good value for money!!
H**E
Five Stars
So far so good ,I like it .
V**D
Rien à redire
Monter sur un vélo de route transformer en vélo mono vitesse. Conforme à la description. Fait très bien le travail. Montage facile. Je recommande
T**S
100% 👍
Ich bin sehr zufrieden, Lieferung top, Verpackung top, Verarbeitung top, sehr leicht (Alu), Einbau top, Einstellungen top, Design top, siehe Bild. Bin jetzt ca. 100 km gefahren keine Probleme, keine Geräusche. Klare Weiterempfehlung 👍
T**L
Finalmente un tendicatena efficiente
Mancava solo un tendicatena efficiente per terminare un progetto iniziato nei cupi giorni del lockdown del 2021: la trasformazione di una MTB bianchi ibex del 1992 in single speed. Il rapporto che ho scelto è un 34:18,abbastanza corto e quindi adatto ai percorsi piuttosto ondulati della cittadina pedemontana in cui vivo. Lavorandoci nei ritagli di tempo, questo lavoro l' ho finito solo questa estate, ma il primo tendicatena che ho usato spesso faceva cilecca: la catena saltava. Eppure il prezzo era molto simile a quello di questo modello che recensisco, che è effettivamente un po' rumoroso, non che l'altro fosse molto più silenzioso, ma non perde un colpo........ di pedale. L'ho provato anche su pendenze maggiori del 12 % e va benissimo. La molla genera una tensione simile a quella del deragliatore posteriore. Se l'avessi acquistato subito avrei risparmiato soldi e qualche piccola frustrazione. Scrivo questa recensione perché finalmente ho completato il mio progetto e, senza questo piccolo pezzo, non sarebbe stato possibile.
L**.
Lo que buscaba
Tensor de bicicleta fácil de instalar parece de buena calidad pero yo le he quitado un protector en forma de "u", que tiene en la roldana, que lo único que hace es que haya un rozamiento entre la cadena y ese protector.
Trustpilot
2 weeks ago
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