Budget hardtails like the San Quentin 1 are incredible value, but their entry-level componentsoften hold them back. Upgrading key parts can make the bike more reliable and more funwithout spending a fortune. Modern cranks with an external bottom bracket are stiffer andmore durable than old square-taper designs, improving power transfer on rough trails.Tubeless tyres allow lower air pressures for better traction and comfort because there’s noinner tube to pinch; they also self-seal small punctures[1]. A dropper post lets you lower thesaddle at the push of a lever for better manoeuvrability on technical descents and then raise itagain for efficient climbing[2]. These upgrades bring big performance gains for minimal cost.

The San Quentin 1 comes with a square-taper crankset and sealed bottom bracket. Whilefunctional, square-taper spindles can wear out under the stresses of aggressive trail riding andmake it harder to remove the cranks. I swapped in a Shimano Deore two-piece crankset with aDB52 bottom bracket. The outboard bearings and hollow spindle are lighter and stiffer,improving pedalling efficiency and durability. Installation required removing the old cranksand bottom bracket, cleaning the threads, then fitting the new BB cups and torqueing thecranks into place. The difference on the trail was immediate: the bike felt more responsiveunder power and the new cranks should last for many seasons of hard use.

Next I tackled the wheels. The stock rims aren’t taped for tubeless and the factory tyres aren’tcompatible, so I added tubeless rim tape, installed tubeless valves and fitted a pair of27.5 × 2.5 Maxxis DHF tyres. Before seating the tyres I added sealant to allow punctures toself-seal. Tubeless systems let you run low tyre pressures for increased grip and comfort, andbecause there’s no tube to pinch you don’t have to worry about pinch flats. According toexperts, the main benefit of tubeless tyres is exactly that: you can use lower pressures for bettertraction without risking pinch flats[1]. I noticed a big improvement in cornering grip andsmall-bump compliance. As a bonus, ditching the tubes saved some rotational weight.

Finally I installed a 170 mm dropper seatpost. This was the most time-consuming job because itrequired routing the remote cable through the frame and cutting the post to fit. Once in place,the dropper completely changes the way the bike rides. Dropper posts can be remotely adjustedwhile riding using a lever on the handlebar; you can quickly lower the saddle to move yourbody over the bike for better control on technical descents and then raise it again for efficientpedalling[2]. On steep climbs I no longer had to stop and manually adjust my seat height, andon descents I could get the saddle out of the way instantly. It’s the single best upgrade you canmake to a hardtail.

• Bottom bracket tool & crank puller: Needed to remove the square-taper cranks and bottom bracket and to install the new external BB cups.
• Tubeless tape & sealant: To prepare the rims for tubeless and seal the tyres.
• Air compressor or high-volume pump: Helps seat the tyre beads on the rims.
• Cable cutters & multi-tool: Useful for sizing and routing the dropper cable and making adjustments.