Switching systems
Throughout the model development, Stromer has used various drive systems, gear ratios, and shifting systems. These include: Shimano, Sturmey Archer, Pinion, and Schlumpf.
Gears
For models with chain drive, the number of available gears ranges from 5 to 27 depending on the model. Various cassettes and up to three chainrings are used.
The models with Pinion gears are equipped with the C-Line gears C 1.6, C 1.9, and C 1.12 with 6, 9, and 12 gears respectively.
The Sturmey-Archer gear hub on the ST2 Belt has 5 gears.
The Schumpf „Speed Drive“ gearbox was used on the ST1t and ST1s from 2016/2017. With the installed Shimano XT 9-speed cassette, it offered a doubling from 9 to 18 gears.
Chainring wear
Wear in the drivetrain is most noticeable on the chain and sprockets, specifically in the most commonly used long gears. The frequently used combination of a 52T chainring with an 11-42T cassette (ST1 2019 and ST1 LCI / ST3 / ST5 / ST5 ABS) features a Gossamer Gear chainring with Narrow/Wide teeth.
Ob ein Ersatz nötig ist, entscheidet eine optische Kontrolle. Gehen die Zähne Richtung eines Dreiecks (Siehe Bild unten) muss gewechselt werden. Bei entsprechender Pflege liegt die Laufleistung über 20’000 km. Bei meinem ST3 wechselte ich bei 34’000 km das esret Mal.
Wear bottom bracket / bottom bracket axle: (ST1 2019 and ST1 LCI / ST3 / ST5 / ST5 ABS)
The bottom bracket is in the splash zone of the front wheel. Here are a few pictures that necessitate the replacement of the bottom bracket (often also referred to as the inner bearing) as well as the bottom bracket spindle.
Installation / Removal: ST1 2019 and ST1 LCI / ST3 / ST5 / ST5 ABS
Crank handle: How to remove and reassemble the left crank arm here.
Bottom bracket: To remove the bottom bracket, special tools are required. This depends on the crankset or bottom bracket used. The Stromer models mentioned here have an FSA bottom bracket installed. – here the
The FSA MegaExo BB-7100 The bottom bracket cups are stamped with the tightening torque, the installation side in the direction of travel (R / L), and the tightening direction (arrow) for assembly.
If you want to loosen the bearing shells, you must turn counter to the arrow!Tool). First, the left crank arm must be removed (8 mm Allen key).
During assembly, the order of the components is as follows: from left to right.
Left: ┘Crank arm left - shaft washer - bearing shell left
-Bottom bracket shell -
Right: Spacer 2 mm - Bearing shell right
The axle (with chainring/crank arm) is inserted from the right, along with the previously slid-on 5 mm spacer.
When tightening, the torque must be observed.
Spare Parts Chain Models: ST1 2019 & ST1 LCI / ST3 / ST5 / ST5 / ST5 ABS
Verschiedene Bauteile der Kurbelgarnitur sind einzeln erhältlich aber nicht alle.
Kurbelarm: Den linken Kurbelarm ck-6028/73 Double gibt es im Original nicht einzeln zu kaufen. Der Kurbelarm „FSA Gossamer MEGAEXO Alloy Left Crankarm CK-6028 Double, 170 mm Left“ von RBP Bike Parts müsste aber passen, getestet habe ich ihn nicht.
Chainring Das FSA Gossamer 52T-Kettenblatt ist Stromer-Custom und hat eine 5-Loch-Befestigung mit einem BCD (Bolt Circle Diameter = Schrauben-Befestigungsdurchmesser) von 130 mm sowie einer Narrow/Wide-Verzahnung. Das Original kann nur bei einem Stromer-Händler gekauft werden, z. B. here or here. (ca. € 60)
When using alternative chainrings (specifically ST3/ST5), it must be noted that the bulge (red arrow) is large enough. With the DECKAS 130 BCD shown above, it is too small, which is why the original chain guard cannot be mounted.
A suitable chainring could be ALITE 5-ARM 52T to be (not tested)
Bottom bracket: The FSA MegaExo BB-7100 The V-Drive NBD (No Pinch Bolt Design) bottom bracket is not available as a spare part from Stromer, but can be purchased from various online shops. A possible alternative to FSA is a Shimano Saint SM-BB80 (Shell Width= 83 mm)
FSA Gossamer ck-6028/73 Crankset The bottom bracket axle (ISIS mount, Ø 24 mm) with chainring mount (BCD 130 mm) and right crank arm, as well as the left crank arm (FSA Gossamer CK-6028 Double, 170 mm) can only be purchased as an original set from a Stromer dealer, e.g. shop.stromer-bike.de or Fratello.bike to be related.
Crank bolt: The bolt on the left crank arm has an M17 thread and an 8mm hex socket. The aluminum lockring measures M27×1 mm and has a left-hand thread (LH). The domed spacer is marked MW497, the second MW080.
The set is a self-extracting construction. Self-extraction means that the left crank arm can be removed with an 8 mm Allen key without loosening the lockring.
See also PROBLEMS Various – ‚Crank arm loose... falls off / cannot be detached‘
Wave washer left and spacer right
The Wave disk (24 x 30 mm) and the Spacer are sold individually.
A longer post on the topic of bottom brackets/crank bearings can also be found in the forum speedpedelecreview.com or in the stromerforum.ch
See also CIRCUIT - Wear‚Wear: Chainring / Bottom bracket‘