I'm thinking of upgrading my Dahon Speed P8 from 8 speed to 20 speed.
01. FD
02. FD adapter
03. left and right shifters
04. Jagwire cable housing and cables
05. 39 teeth chainring
If I opt for 20 speed, add
06. 10 speed RD
07. 10 speed chain
08. 10 speed cassette
09. Shimano Deore V-brakes calipers and levers.
How much do you guys think it will cost, in Singapore? And also any idea/recommendations who can do it?
Thanks!
Ah... I downgraded from 24 to 20 speed on my Tern. So maybe I can share some information with you.
Is your Dahon speed P8
this version?
You will need FD adapter and RD hanger (to use normal RD).
The contents below are for flatbar shifting.
I suggest you overhaul everything to 10 speed. Your current 52T may limit your top speed if you switch to ten speed cassette, unless of course you just wanna climb hills.
On 406 tyres, the recommended drivetrain will be 55/42 chainring with 32-11T 10 speed cassette. This will give you a gear ratio from 25 to 95". Changing to 10 speed means you have to get 10 speed RD and chain as well.
Your tyres may need to be changed to get the best out of your new modified gearing. Schwalbe Kojak for a balance of speed and comfort, or Schwalbe Durano/Panaracer Minits for speed.
There is no reason to change your v-brakes since it is working well.
I suggest you go Togoparts and get second hand parts. You will be surprised by the quality and price these second hand components can fetch and provide. For your usage, Shimano Tiagra 10 speed rear with 55/42 chainrings will be more than sufficient to cover hill climbing to cruising. I use the money originally set for Tiagra upgrade to get second hand Shimano Ultegra groupset.
As for Shimano or SRAM, you have to go online and see how the shifting is done for flatbar. I used both before and without a doubt, I will pick Shimano trigger shifters over SRAM shifters any day. Prefer to use both my thumb and index finger to shift accordingly. Once you decided over one brand, then stick to it. Better don't mix different brands together due to different pull ratio.
You will need the following:
1) FD and RD adapters
2) Pair of 10 speed flatbar shifters (for FD and RD).. Should be the most expensive
3) 10 speed RD, 2 speed FD
4) 10 speed chain, 10 speed cassette
5) 10 speed crankset with compatible BB. The mechanic may need to insert spacer to ensure good chain alignment
6) Some drinks for the mechanic!
For installation, its true that some LBS don't welcome walking customers who buy bike stuffs online or second hand. So far I am always welcome by Scootz AMK and the mechanics are more than happy to learn and share their knowledge and information with me during installation. Sometimes I just go over and discuss with them my next upgrade project, and will seek their advice and expertise.
