Here some more inf. on this subject...
Since last Oct., 6 friends including 1 Turkish cyclist and 1 Transalp Rider done it to India through Iran and Pakistan.
During this period, been to Iran consulate in İstanbul personally together with 2 GB.Bikers for visa application.
1-Except American and Israel citizens, you can ride,drive until Bam free..You will meet the escort there to follow to Pakistan bordergate.Its free except for cyclists..If you are cycling, you have to hire a car to be able to follow the escort in normal speed and escort police checks all taxis there for safety and prices...Consulate personal here and all escort guys are friendly.
2-Iran consulate in İstanbul accepts all visa applications everyday except fridays and holidays and until 11,30 am..Better be there at 9 as you will be given bank information by the door guard first, then run to the bank,make the visa fee payment,bring the receipt to the consulate then fill the form and complete paperwork..Generally same they the following week after mid day, passports are given back with visas..
There are 2 ways of getting İranian visa..
You can also apply to Iran Embassy in Ankara..
here is the link for information in details..Read the paragraphs starting with Other foreign nationals..
Iranian Embassy - Ankara> Consular Affairs> Visa Form Aliens
Higly recommend: don't miss the Iran local people hospitality and cuisine.
Other option to reach mid-south east asia is boring..
You will definitely meet same experiences and feelings in blogs of bikers who have been there..
Wish you all the best.