Originally Posted by
3alarmer
.
....that's a short cage rear, I think, from your pictures. That limits yoiur total overall gearing range (high to low). But as stated above, you can drop the gearing overall by reducing the size of the rings on the front.
Based on the
photo of the Simplex SX610 GT/SP at this page on Mike Sweatman's Disraeli Gears website, I'm fairly sure you're correct. The cage on the OPs RD certainly looks shorter than the one in the photo at Disraeli.
Edited to add: sorry, posted the above before I saw that the OP had already come to the same conclusion. Oh well, probably not my first mistake of the day . . . or the last.
