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Untighten the wheel, move forward to take the belt of the sproket, remove wheel, open the rear triangle, slide the belt out through the opening.

If a 60T sprocket does not fit, we can look at 19/55 (see below). For that @Ravi Kempaiah needs to confirm how much range there is at the rear axle to move the wheel forward or backward.

I agree, if a 60T sprocket fits, I think you should go for 20/60 with 130T belt. @Ravi Kempaiah would only needs to confirm that a 60T gates sprocket would not interfere with the rear arm!

You can download the excel sheet in post #4 to run any simulation below the screen copy of 20/55 65 With the same 128 belt, this corresponds to a 494mm chainstay or 5mm more, so the bike needs to have at least 7/10 mm available to move the wheel back

From the gates calculation, we know 20/60 with the 130T belt would fit. Ravi can get you the right parts, and the shop install it. An hour of labor at most...

I am not following. There is a lor more work involved in replacing the rohloff by a derailleur than simply changing the sprockets and belt. Replacing the rohloff would mean not only replacing both sprockets as required for the belt upgrade, but also completely rebuilding a new wheel. So more...

Always happy to help :) Can you share how much range there is on the chainstay on either side of the nominal 489mm?

We cross posted. 2.5 is a minimum not a maximum, so no reason not to go to 3...

@Cybersnow Actually, 2.5 is a minimum, not a maximum. https://www.rohloff.de/en/service/handbook/speedhub/tables So there is no reason there would be a warranty issue by going to 3, it is actually recommended for higher torque an load usage

You should definitely do that. Normally Rohloff sets a ratio limit of 2.5. Unless you would be hammering the hub with max power in wrong gear, I am pretty sure that going to 3 (60/20) would be fine, but if you want to be safe warranty wise, it should be done with Zen's approval indeed...

If you are happy with the speed table I gave you for the 20/60 gear ratio, I think you are fine with a 130T belt. If you want to go with the 19/60 ratio, then using the same 130T belt, the chainstay is 493mm or 4mm more than what you have now. Gates recommend to have 10mm (.39") available...

I found the radius of the 55T, it is 95.4mm = 3.76" and the radius of the 60T is 104mm = 4.09" So the 60T will extend 8.6mm or 0.34" from the current one (a little under 3/8")

128T confirms the belt size 19 1/8 is 486mm close to the 489 that is the nominal for that belt and 55/20 sprocket. Probably the imprecision of the measurement. When you say 1/4 (6.35mm) or 3/8 (9.5mm), do you mean on each side of the axle (forward AND backward)? May be take a picture of the...

Good so you can go to 60. Now if you can confirm the 4 points above in my post #25, we can narrow down on the best upgrade scenario :)

I found a value for the chainstay on Zen site of 489mm (TO CONFIRM) If that is correct, the gates calculator tells me that a 55/22 would use a belt with 128 teeth which leads to a chainstay of 489mm Now if I use a 60/19 sprocket set with the same 128 belt, I get a needed chainstay of 481.5mm...

OK, so problem is It does not look like there is a 57T front sprocket, it goes from 55 to 60. So the closest to the 22+55 = 77 would be 19 +60 =79 at a pedaling cadence of 60, here are the result for 19 rear 60 front For a cadence of 70 So speed wise you are good with 19/60, but the...

@Cybersnow can you check what chainring adapter is on the bike? 4 bolt 104mm BCD or 5 bolt 130mm BCD

Why not increase assistance...

18mph on gear 14