{"id":1581,"date":"2025-07-08T21:44:51","date_gmt":"2025-07-08T19:44:51","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&p=1581"},"modified":"2026-08-05T22:47:45","modified_gmt":"2026-08-05T20:47:45","slug":"chainring-bottom-bracket-wear","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/kettenblatt-tretlager-verschleiss\/","title":{"rendered":"Wear: Chainring \/ Bottom Bracket (Spare Parts)"},"content":{"rendered":"

Switching systems<\/h3>\n\n\n\n

Throughout the model development, Stromer has used various drive systems, gear ratios, and shifting systems. These include: Shimano, Sturmey Archer, Pinion, and Schlumpf<\/a>.<\/p>\n\n\n\n

Gears<\/h3>\n\n\n\n

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.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

The Sturmey-Archer gear hub on the ST2 Belt has 5 gears.<\/p>\n\n\n\n

The Schumpf \u201eSpeed Drive\u201c 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.<\/p>\n\n\n\n

Chainring wear<\/h3>\n\n\n\n

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.<\/p>\n\n\n\n

Ob ein Ersatz n\u00f6tig ist, entscheidet eine optische Kontrolle. Gehen die Z\u00e4hne Richtung eines Dreiecks (Siehe Bild unten) muss gewechselt werden. Bei entsprechender Pflege liegt die Laufleistung \u00fcber 20’000 km. Bei meinem ST3 wechselte ich bei 34’000 km das esret Mal.<\/p>\n\n\n

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Comparison of old versus new: ST1 2020 with 23,000 km<\/figcaption><\/figure>\n<\/div>\n\n
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ST3 – 13’000 km – das Blatt ist noch ok.<\/figcaption><\/figure>\n<\/div>\n\n
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Vergleich Alt und Neu bei einem ST2S mit 19’000 km. Die Z\u00e4hne sind stark abgenutzt (Dreiecksform), das Blatt muss gewechselt werden.<\/figcaption><\/figure>\n<\/div>\n\n
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Stromer Gossamer 52T from an ST1 2020 (41,000 km) vs. DECKAS 130 BCD narrow wide (Aliexpress) and Gossamer 52T, new<\/figcaption><\/figure>\n<\/div>\n\n\n

Wear bottom bracket \/ bottom bracket axle: (ST1 2019 and ST1 LCI \/ ST3 \/ ST5 \/ ST5 ABS)<\/h3>\n\n\n\n

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.<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

Installation \/ Removal: ST1 2019 and ST1 LCI \/ ST3 \/ ST5 \/ ST5 ABS <\/h3>\n\n\n\n

Crank handle:<\/strong> How to remove and reassemble the left crank arm here<\/a>.<\/p>\n\n\n\n

Bottom bracket:<\/strong> 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. \u2013 here the <\/p>\n\n\n\n

The FSA MegaExo BB-7100<\/a> 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<\/a>). 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: \u2518Crank 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.<\/p>\n\n\n\n

Spare Parts Chain Models: ST1 2019 & ST1 LCI \/ ST3 \/ ST5 \/ ST5 \/ ST5 ABS<\/h3>\n\n\n\n

Verschiedene Bauteile der Kurbelgarnitur sind einzeln erh\u00e4ltlich aber nicht alle. <\/p>\n\n\n\n

Kurbelarm:<\/strong> Den linken Kurbelarm ck-6028\/73 Double gibt es im Original nicht einzeln zu kaufen. Der Kurbelarm \u201eFSA Gossamer MEGAEXO Alloy Left Crankarm CK-6028 Double, 170 mm Left\u201c<\/a> von RBP Bike Parts m\u00fcsste aber passen, getestet habe ich ihn nicht.<\/p>\n\n\n

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RBP Random Bike Parts<\/a> eBay<\/figcaption><\/figure>\n<\/div>\n\n
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The Stromer Original \u2013 FSA Gossamer<\/figcaption><\/figure>\n<\/div>\n\n\n
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Chainring <\/strong>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-H\u00e4ndler gekauft werden, z. B. here<\/a> or here<\/a>. (ca. \u20ac 60)<\/p>\n\n\n\n

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.<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

A suitable chainring could be ALITE 5-ARM 52T<\/a> to be (not tested)<\/p>\n\n\n

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\"\"<\/figure>\n<\/div><\/div><\/div>\n\n\n\n

Bottom bracket: <\/strong>The FSA MegaExo BB-7100<\/a> 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)<\/a><\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

FSA Gossamer ck-6028\/73 Crankset <\/strong>The bottom bracket axle (ISIS mount, \u00d8 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<\/a> or Fratello.bike<\/a> to be related.<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

Crank bolt<\/a>:<\/strong> The bolt on the left crank arm has an M17 thread and an 8mm hex socket. The aluminum lockring measures M27\u00d71 mm and has a left-hand thread (LH). The domed spacer is marked MW497, the second MW080.<\/p>\n\n\n\n

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<\/a> also PROBLEMS Various \u2013 \u201aCrank arm loose... falls off \/ cannot be detached\u2018 <\/em><\/p>\n\n\n

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The spacer disc MW080 mounted on the axle side is missing from the picture<\/figcaption><\/figure>\n<\/div>\n\n\n

Wave washer left and spacer right<\/strong><\/p>\n\n\n\n

The Wave disk<\/a> (24 x 30 mm) and the Spacer<\/a> are sold individually.<\/p>\n\n\n

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Article number: 402152<\/em><\/figcaption><\/figure>\n<\/div>\n\n
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Article number: 402150<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n
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A longer post on the topic of bottom brackets\/crank bearings can also be found in the forum speedpedelecreview.com<\/a> or in the stromerforum.ch<\/a><\/p>\n\n\n\n

See<\/a> also CIRCUIT - Wear\u201aWear: Chainring \/ Bottom bracket\u2018<\/em><\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

Schaltsysteme Im Laufe der Modellentwicklung hat Stromer verschiedenste Antriebssysteme, \u00dcbersetzungen und Schaltsysteme verwendet. Dazu geh\u00f6ren: Shimano, Sturmey Archer, Pinion und Schlumpf. G\u00e4nge Bei den Modellen mit Kettenantrieb reicht die Anzahl der verf\u00fcgbaren G\u00e4nge modellabh\u00e4ngig von 5 bis 27. Es werden verschiedene Kassetten und bis zu drei Kettenbl\u00e4tter verwendet. Die Modelle…<\/p>","protected":false},"author":1,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[205,218,209],"ht-kb-tag":[547,580],"class_list":["post-1581","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-p-kette-kettenblatt-riemenscheiben-riemen","ht_kb_category-verschleiss","ht_kb_category-p-schaltung","ht_kb_tag-distanzring","ht_kb_tag-kettenblatt"],"_links":{"self":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1581","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/comments?post=1581"}],"version-history":[{"count":120,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1581\/revisions"}],"predecessor-version":[{"id":12827,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/1581\/revisions\/12827"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=1581"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=1581"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=1581"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}