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Let's collect a list of all the front tire choices and any ride reports for the tire.
In general, the size closest to stock is 130/80-18 or 5.10-18. Also, the stock tire weighs 8.65lbs and the front rim is 2.5" wide.
For reference, here are some calculated tire sizes (which is not always accurate but should be close):
These are the tires I have researched:
Bridgestone TW203
Avg. Price: $65
Use: 20% Dirt / 80% Road
Sizes, Weight:
130/80-18
Notes:
Bridgestone TW302
Avg. Price: $70
Use: 50% Dirt / 50% Road
Sizes, Diameter, Weight:
4.60-18, 25.9", ~12.6lbs (per my bathroom scale)
120/80-18, 25.9", ~13lbs
130/80-18, 26.57", ~11lbs
Notes: Review
Continental TKC 80
Avg. Price: $130
Use: 60% Dirt / 40% Road
Sizes, Diameter, Weight:
3.50-18, ?, ~13lbs
120/90-18, ?, ~14lbs
140/80-18, ?, ~15lbs
150/70-18, ?, ~15lbs
Notes: Rated for Mud and Snow (M+S). Can fit snow chains
Dunlop D606
Avg. Price: $95
Use: Approximately 50/50 based on customer reviews
Size(s), Diameter, Weight:
120/90-18, 26.80", 12.2lbs (per my bathroom scale)
130/90-18, 27.40", 14lbs
Notes: Review on the old TW200 forum
Dunlop D908RR
Avg. Price: $195
Use:
Size(s), Weight:
140/80-18, 14lbs
IRC 110R
Avg. Price: $95
Use: 10% Dirt / 90% Road
Size(s), Weight:
4.50-18,
5.10-18,
120/80-18
IRC GP-1
Avg. Price: $95
Use: 20% Dirt / 80% Road
Size(s), Weight:
4.60-18, 15lbs
5.10-18, 16lbs
Notes: Review
Kenda K270
Avg. Price: $75
Use: 50% Dirt / 50% Road
Size(s), Diameter, Weight:
4.50-18, 26.90", 15.28lbs
4.60-18, 25.65", 11.60lbs
5.10-18, 26.90", 15.08lbs
120/80-18, 25.88", 10.39lbs
Notes: Lightest tire in this list
Kenda K760 Trakmaster II
Avg. Price: $70
Use: 90% Dirt / 10% Road
Size(s), Diameter, Weight:
110/100-18, 27.06", 13.38lbs
120/100-18, 27.22", 14.29lbs
Kenda K784 Big Block
Avg. Price: $95
Use: 40% Dirt / 60% Road
Size(s), Diameter, Weight:
140/80-18, 26.8", 14.9lbs
150/70-18, 26.3", 16.4lbs
In general, the size closest to stock is 130/80-18 or 5.10-18. Also, the stock tire weighs 8.65lbs and the front rim is 2.5" wide.
For reference, here are some calculated tire sizes (which is not always accurate but should be close):
Code:
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
100/90-18 3.5in 12.5in 25.1in 78.8in 804 -4.2%
120/80-18 3.8in 12.8in 25.6in 80.3in 789 -2.4%
130/80-18 4.1in 13.1in 26.2in 82.3in 770 0.0% (STOCK SIZE)
150/70-18 4.1in 13.1in 26.3in 82.5in 768 0.3%
120/90-18 4.3in 13.3in 26.5in 83.3in 761 1.2%
110/100-18 4.3in 13.3in 26.7in 83.8in 756 1.8%
140/80-18 4.4in 13.4in 26.8in 84.3in 752 2.4%
130/90-18 4.6in 13.6in 27.2in 85.5in 741 3.9%
These are the tires I have researched:
Bridgestone TW203
Avg. Price: $65
Use: 20% Dirt / 80% Road
Sizes, Weight:
130/80-18
Notes:

Bridgestone TW302
Avg. Price: $70
Use: 50% Dirt / 50% Road
Sizes, Diameter, Weight:
4.60-18, 25.9", ~12.6lbs (per my bathroom scale)
120/80-18, 25.9", ~13lbs
130/80-18, 26.57", ~11lbs
Notes: Review

Continental TKC 80
Avg. Price: $130
Use: 60% Dirt / 40% Road
Sizes, Diameter, Weight:
3.50-18, ?, ~13lbs
120/90-18, ?, ~14lbs
140/80-18, ?, ~15lbs
150/70-18, ?, ~15lbs
Notes: Rated for Mud and Snow (M+S). Can fit snow chains

Dunlop D606
Avg. Price: $95
Use: Approximately 50/50 based on customer reviews
Size(s), Diameter, Weight:
120/90-18, 26.80", 12.2lbs (per my bathroom scale)
130/90-18, 27.40", 14lbs
Notes: Review on the old TW200 forum

Dunlop D908RR
Avg. Price: $195
Use:
Size(s), Weight:
140/80-18, 14lbs

IRC 110R
Avg. Price: $95
Use: 10% Dirt / 90% Road
Size(s), Weight:
4.50-18,
5.10-18,
120/80-18

IRC GP-1
Avg. Price: $95
Use: 20% Dirt / 80% Road
Size(s), Weight:
4.60-18, 15lbs
5.10-18, 16lbs
Notes: Review

Kenda K270
Avg. Price: $75
Use: 50% Dirt / 50% Road
Size(s), Diameter, Weight:
4.50-18, 26.90", 15.28lbs
4.60-18, 25.65", 11.60lbs
5.10-18, 26.90", 15.08lbs
120/80-18, 25.88", 10.39lbs
Notes: Lightest tire in this list

Kenda K760 Trakmaster II
Avg. Price: $70
Use: 90% Dirt / 10% Road
Size(s), Diameter, Weight:
110/100-18, 27.06", 13.38lbs
120/100-18, 27.22", 14.29lbs

Kenda K784 Big Block
Avg. Price: $95
Use: 40% Dirt / 60% Road
Size(s), Diameter, Weight:
140/80-18, 26.8", 14.9lbs
150/70-18, 26.3", 16.4lbs
