Originally Posted by
3alarmer
.
...in terms of actual shifting performance, they're not as good as the slant parallelogram Suntour, but roughly about as good as every other contemporary mechanism. The real issue is durability, and the amount of Delrin plastic in whichever one you're talking about.
They made a lot of them, in different models over the years. Some were more durable than others. The plastic does not age well.
The classic, period correct replacement for a Delrin Simplex derailleur is a Suntour VGT. I Googled it just today and got a host of hits.
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