Originally Posted by
Raman
The newer BB26 part on SRX accommodates that 251mm wheelbase on the TT02 S type chassis. This was previously not an option with the original BB26 (54634)
I changed my 419XR from the original arms to the 420 arms when they initially came out. While the shape of the 420 arms are different, they have no effect to on wheelbase.
I also just installed the 420 arms on my TT02S.. with the original 54634 suspension mounts with no changes in wheelbase.
I don't see any mention of 251mm WB in the manual or product page. If there was a 251mm option, there would be an extra spacer in front of the rear arms in standard wheelbase instructions.
The shorter BB26 are necessary with 420 arms for correct wheel position. The front arms are also different, so you may have correct wheelbase, but wheels will be shifted by couple of milimeters compared to reversible arms.
TRF419 suspension upgrade manual shows 3mm increase in wheelbase on the rear arms... But on the TRF, that can be compensated for with spacers.
