If you can't find what you want in La Paz, then you may have luck in Cusco. Its hard to find the good stuff in Bolivia. You might have better luck in Santa Cruz, but that's a bit out of your way at this point. I bought a Pirelli in Cusco, via the boys at the Honda dealer. They took me to another location (it wasn't clear if it was their shop or not) where I got what I needed, a cheap Brazilian... Sometimes on the road you buy what you can find. I wasn't looking for off road by that point in my trip, so it was fairly easy to find a piece of rubber that fit my wheel.

I'm a little confused my your post. The Trans Amazonian (BR-230) doesn't go to Venezuela. It starts a little east of Humaitá, then goes more or less east, not north. I think you are planning to take BR-319 from Porto Velho, passing Humaitá, to Manuas, then north to Venezuela. The 420 mile road between Humaitá and Manuas is not maintained by the government and its a challenge in the dry season, with few to no services. Ok, from everything I have read, there are no services. Assuming this is your route, know that February is the wettest month of the year for that part of the Amazon. You could be lining up to tell a 420 mile mud story. I met a French guy in La Paz who took BR-230 in December. He said he had never dropped his so many times...in the mud. If you make it, you'll have bragging rights that no one can touch. I was thinking about it, but changed my route. I'll take on BR-319 another day.

If you are taking the Trans Amazonian, well prepare for mud that way too. Either way you go, plan to buy the knobbiest tires you can find. Carry the off road tires with you until you are deep into Brazil and running out of tarmac or the rubber is running out on what you got. Its not so bad to carry a tire; lots of riders do it.

Have fun. I wish I was traveling with you.

__________________
Peter B
2008/09 - NJ to Costa Rica and back to NJ
2012/13 - NJ to Northern Argentina, Jamaica, Cuba and back to NJ
2023 - Peru, Brazil, Paraguay, Argentina, Chile, Bolivia...back to Peru.

Blogs: Peter's Ride