I know they come with a 150/80B16 factory, but can you clear a 160 without any modification or not? Also do you know where to find a 160 tire for around 100 bucks?

A 160 Metzler 880 or Avon Venom will fit without modification. Both have a slightly taller profile, so if the bike has been lowered at all it may rub the underside of the fender.

BUT, ya won't find them for $100.00

Metzeler ME 880 Marathon Touring Rear Tire - 160/70VB-17/--

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Size Name: 160/70VB-17
First Select Size Name 160/80B-16 150/70B-18 200/60VR-16 130/90HB-16 170/60VR-17 140/80HB-15 200/50ZR-17 180/55ZR-18 150/70HB-18 140/80VB-17 150/80HB-16 170/80HB-15 150/80VB-15 150/80B-16 140/90HB-16 160/70HB-17 140/70HB-18 140/90HB-15 180/60HR-16 180/70HB-15 170/60R-17 260/35VR-21 240/50VR-16 160/70VB-17 150/90HB-15 200/70HB-15 300/35VR-18 240/40VR-18 180/70HR-16 200/50R-18 210/50ZR-17 280/35VR-18 MU85B-16 MT90B-16 MU85B-16 RR 260/40VR-18 160/60VR-18 210/40R-18 150/70VB-18 Color Name: --
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Price: $313.95 Sale: $213.99 You Save: $99.96 (32%)

Wow what a big difference in price, heck 200 mm tires dont cost that much

how about this.
CLOSEOUT!
Was: $144.99
Now: $108.74
Maxxis Rear Touring 160/80HB-16 Blackwall Tire
Dennis Kirk Part #: 650321
Manufacturer Part #: TOURING M6011
Special Closeout Pricing!
Aspect Ratio: 80
Construction: Bias
Position: Rear
Rim Size: 16
Sidewall: Blackwall
Speed Rating: H
Tire Classification: Touring
Tube Type: Tubeless
Units: Each
Width: 160

You can't just go by size alone, as the same size tire can vary in width and height between different brands.

For example;

The 'stock' Dunlop D401 150/80B16 has a width of 6.15" and height of 24.45".

The lower cost bias ply Dunlop D404 150/80-16 is narrower and not quite as tall as the same size D401.

You really need to get detail specifications of a specific tire, because size alone isn't enough to determine actual width.

What about this one, any specs on this as far as fit?

Sure..I have a 160 I will sell you for $99.99...currently it is being used by my Great Niece and Nephew as a tire swing....shouldnt be too difficult to 'boot' the 1/2" holes in it.......seriously though...pay $100 for a tire and guess what you get......give up?...you get a cheap assed tire...good luck...

Just in case this helps....I installed an 18" rear chrome wheel with a 160 Metzeler on my '05 Sportster. No mods needed to be made at all as it fit right in with the stock spacers. I did this with the help of Hogpro, whom I purchased my wheels from. Check out the pics on the photobucket link below.

What 18" wheel should I look for that will work on a sportster? Since its an 05 with the 1" axle I should have quite a few wheels to choose from should I? Is the tire cheaper for an 18" rim?