Сергей, тебе же написали уже, что тебе надо выбирать ТРЕЩЕТКУ, а ты выбираешь кассету. Это две большие разницы, хотя внешне похожи издали. Если ты решишь поставить кассету, это ОДНОЗНАЧНО ведет к замене втулки, (резбовую надо менять на шлицевую) и соответственно еще одному удорожанию всего проекта. Но это хорошо, тк ты постепенно придешь к варианту покупки нового велика, как более рациональному

Что-то я не вижу трещёток на 8 или 9 звёзд.

а их и не существует под 8-9 звёзд...

8 Speeds
In the early 1990s, the industry moved to 8-speed clusters with 130 mm spacing. 8-speeds were available in both freewheel and cassette hubs. As with the move from 4- to 5-speed, and from 5-speed to 6-speed, this required adding spacers to the right-hand end of the axle to keep the chain from rubbing on the frame.

As it turned out, the increased length of un-supported axle sticking out from the right side of the hub was just too long for traditional 10 mm threaded axles. 8-speed freewheels were sold for several years, but a very large percentage of the riders who bought them wound up having problems with axle breakage/bendage. As a result, 8-speed freewheels eventually pretty much disappeared from the market.

This also coincided with the increasing popularity of the cassette Freehub ® which didn't have the problem of axle protrusionn. As the number of sprockets has continued to increase to 9 and now to 10, thread-on freewheels have become obsolete for high-end applications. 9- or 10-speeds have never been produced, as all modern derailer bikes of decent quality use the much superior cassette Freehub system.

концептуальный спор "были ли трещотки на 8 звёзд", прошу в другую тему, не флудите и не сбивайте человека с толку.