Check these out!!!
These "wheel slammers" really caught my eye as a better alternative to the traditional chain tensioner.
Simply measure the space between your axle and the front of your drop out and fill it with one of these bad boys that slot right into the drop out (see below) .
The picture above has the "wheel slammers" and also the "peg adaptor" which is a washer with a large centre hole that fits over the "wheel slammer" for anyone that wants to run pegs. Dialled.
These come in the following sizes;
1.5 and 2.0mm (for those who wheels are close to being slammed in the dropout)
2.5 and 3.0mm
3.5 and 4.0mm
4.5 and 5.0mm
5.5 and 6.0mm
6.5 and 7.0mm
7.5 and 8.0mm (for those who like their back wheel close to the back of the dropout)