The 240 is as wide as you can go on our bikes due to the wider drive belt......... or mine would be sporting a 260!
Actually the Breakout can go to 260 without any modifications. I know several who have done this and I will be doing my switch to 260 in a few months.
why did you not go for the 140 70 21?
Just to show you guys through some basic math that the 120 wide front tire is closer to the standard 130 tire (opposed to the 140 wide tire):
Tire           Width       height     diameter       height         Circumference
Standard    130             60            21           27,14"        85,27"
New 1        120            70            21           27,61"        86,75"
New 2        140            70            21           28,72"        90,22"
                                                         120        140      
Difference height  standard - New:           1.20%    4.00%
Difference Circumference standard - New: 1.48"      4.95"
Percentage difference standard - New:     1.71%    5.48%
So even though you'd think that the difference is just 10mm wider or smaller, it has a pretty big impact on the total wheel/tire sizes. I know the speedo is feeded information from the rear tire, so these differences won't really appear, but just for arguments' sake, here's the difference in milage your speedo would show if the front wheel would feed the speedo:
                           Standard   120      140
Difference in miles   35           35,6    37,03
                           50           50,9    52,90
                           60           61,0     63,48
                           80           81,4     84,64
                           100         101,7  105,80