The 79 resto mod went from this.
to this
Was an 18 x 2.15 stock rim with a half worn old 4.00 18 Conti go
Now a Pilot Activ 4.00 x 18 on a 2.50 x 18 MikesXS rim, Mikes SS spokes.
spiffed up the inside of the hub a bit while I had the spokes off. Got rid of the webs in the casting where the molds join and smoothed and polished the tops of the fins a bit.
Got a bit aggressive with a coarse sanding disc so did not get a mirror finish on the hub flanges.
The 2.5 18 rim is not drilled as a very good match to the XS rear hub.
I was shocked, shocked, I tell you! I did some spoke hole filing and straightening but straight up, it needs more work. The rim did true up nicely. The spokes all fit perfectly quality was great and as I have seen from them lately there were 2 extra inner and outer spokes with nipples in the set.
I really like the way the 4.00 tire profile looks on the wider rim.
Michelin recommends a 2.5 rim as the best size for the 4.00 18 tire.
Better part of three days to get it all done. Took it out for 80 miles of back road bombing tonight and am happy. I have the "matching" 100/90/19 Pilot Activ on a 2.15 mikes front rim. After 80 miles of spirited (but saw over 25 deer!) riding the chicken strips are narrower on the new tire than the old one. Handling seems good, I seem to have more confidence in how the bike feels leaned into corners. Having two new good quality matched tires might help that a bit too.
Last pic is a comparison of the 4.00 18 Pilot Activ with a Battlax BT45F 110/90/18 both are new.
The 4.00 is nearly 3/4" bigger OD, it is a heavier, stiffer tire than the battlax also. The Activ tire was a challenge to mount even with my old Coats 200, being stiff and a bit small on the ID.
The rims are a slight mismatch as the front is flanged the 2.5 18 rear cannot be found flanged at a decent price.