If you have a custom bearing (extra flange) in the top of the seat stay pivot

(Example: String is 140mm long)

plus adjustable clamping pressure to help prevent thin-walled tube damage

SRAM 12-speed XD Driver:

3 - After Bite Wipe

Shimano 9 Speed Jockey Wheel Set - High Grade - Deore XT Level PDP|Colour If you have a customShimano's Genuine 9 speed derailleur jockey wheels are available in different quality levels. Both are cross compatible. The High Grade wheels feature 1 x Ceramic bushing and 1 x sealed bearing. These are standard equipment in RD 6770 6700 A 6700 6600 6500 M772 M771 M770 M761 M760 M751 M750 M810 A M810 M806 M805 M801 M800 C910 T780 The Standard grade wheels are original equipment on RD 5701 5700 A 5700 5600 5501 5500 4601 4600 4500 4400 3500 3400 3300