Hiya Folks,
I got a used Suntour Cyclone Mk2 GT RD six months back and I noticed at the time that the pulleys were a bit crunchy.
I could have swapped in my VX GT pulleys but they would still be 40 years old so I had a look for alternative pulleys and found Bullseyes (expensive)
and some other metal ones on Ebay. Not sure I really want metal pulleys so I let it wait.
Finally I've got some, mainly because of the fine price as I was perusing Amazon. I've just installed them so here's the info
in case it helps anybody else.
BBB Rollerboys BDP-01
£10 on Amazon:
https://www.amazon.co.uk/BBB-Pulleys...DU0/ref=sr_1_3
10T sealed roller bearings, with shims for different diameter mounting bolts.
It has the same diameter as Suntour: 32 min / 38 max
Comes with 4 sets of shims, the largest (set D) is about 5.9mm ID and just fits Suntour.
But it's 1mm thinner with the '6mm' shims installed: 9.3 mm, Suntour pulleys I've measured are 10.3mm wide.
The pulleys are not identical: the A pulleys have chamfered teeth, no idea why.
They also have a rotation direction arrow, probably related to the chamfered teeth.
Here's the instructions on the back of the box:
And here's what they look like (Suntour at the bottom for comparison)
:
Fitting:
Used a felt tip to mark rotation direction before I took the RD off the bike because that's way easier than thinking too much.
Added 2 M6x12mmx0.5mm stainless steel shim washers to each pulley making the width 10.3mm
Shims are a tight fit - used a ratchet clamp to push the bolts home first time, then they were fine.
Results:
I've only done about 1 mile so far since the weather is a bit cr*p.
Definitely quieter than the originals.
Definitely rotate easier.
Shifting seems fine but need a longer test ride.
So I'm very happy with them so far but need a longer ride to test the shifting more.
I'll update this if I hit any problems.
Update: +19 miles and they're just fine. Shifting is a bit crisper, but it's all quite subjective.
Update: 272 miles and still fine, freewheeling down hill is faster too
