Author Topic: 1984 Raleigh Grifter BMX build (Read 19485 times)

Lpodonovan · « **Reply #25 on:** January 03, 2017, 11:54 AM »

The euro / mtb bottom bracket I ordered pre-Christmas still hasn't showed up and is unlikely to arrive for a few days. I only need the bearings and dimensions from the set up as I will be making new bb cups to suit the Grifter frame. This is now seriously holding up completion (and a fresh paint job!)

Lpodonovan · « **Reply #26 on:** January 03, 2017, 01:13 PM »

Parts update as I have mainly mid-school parts lying around Ive fitted;

Selle turbo seat
GT stem
Odyssey power paw grips
Odyssey Pitbull I rear brake and Pitbull lever
Profile imperial chainwheel
Odyssey crankset
DK handlebars

Ive also picked up some free wheels and tyres!

rodriguez · « **Reply #27 on:** January 03, 2017, 01:23 PM »

Great project, have often thought about doing one myself, enjoying the updates.

What top tube length does a Grifter have?

Lpodonovan · « **Reply #28 on:** January 03, 2017, 04:43 PM »

Bottom bracket sorted!

Lpodonovan · « **Reply #29 on:** January 03, 2017, 04:46 PM »

We have a rider!

Lpodonovan · « **Reply #30 on:** January 03, 2017, 04:47 PM »

More pics

Lpodonovan · « **Reply #31 on:** January 03, 2017, 04:48 PM »

and more pics

Taipan · « **Reply #32 on:** January 03, 2017, 05:51 PM »

Cool!

now just cut/lower and reweld the top rear 2 triangle tubes so they match the top tube for a better riding angle

you may need to trim the seatpost down a little aswell to make it more atheseasticly pleasing

Lpodonovan · « **Reply #33 on:** January 04, 2017, 08:40 AM »

Quote from: rodriguez on January 03, 2017, 01:23 PM

Great project, have often thought about doing one myself, enjoying the updates.

What top tube length does a Grifter have?

Centre of seat tube to centre of headtube is 19 inch

Lpodonovan · « **Reply #34 on:** January 04, 2017, 08:44 AM »

Quote from: Taipan on January 03, 2017, 05:51 PM

Cool!

now just cut/lower and reweld the top rear 2 triangle tubes so they match the top tube for a better riding angle you may need to trim the seatpost down a little aswell to make it more atheseasticly pleasing

I always appreciate good advice thanks!

In this case I'm going to leave rear as-is but only as (and this is very surprising for me) it actually rides really well. Seatpost (length and clamp area) is however getting chopped today for sure as it has been bugging me!

Lpodonovan · « **Reply #35 on:** January 04, 2017, 02:25 PM »

Quote from: Lpodonovan on January 03, 2017, 04:43 PM

Bottom bracket sorted!

This turned out to be reasonably simple if you have a lathe and some aluminum.

Things to watch out for;

6804 2RS bearing are 20mm ID x 32mm OD x 7mm Wide and you use 2 per side / 4 in total. There is not an equivalent small bearing with a standard 19mm ID (which would fit inside the Grifter BB) therefore a 20mm centre section spindle tapering to 19mm is required to fit 3-piece cranks (and take up the slack)

The BB shell is very wide (70+mm) therefore a longer 153mm crank spindle is required and the home made bearing cups only have a 3mm 'outer lip' as per the (rubbish) drawing in order to maintain the correct chainline

Due to the Grifter threaded bb I opted for an interference fit on the home made bearing cups this is critical to ensure alignment mine are probably a bit over size and may never come back out of the frame as Ive pressed them in with a hydraulic press

rooski · « **Reply #36 on:** January 26, 2017, 07:31 PM »

Excellent work

Top engineering skills, do a bit of this myself

deeman · « **Reply #37 on:** January 30, 2017, 01:42 PM »

Have you ridden it yet? be interested to see how it rides!

Lpodonovan · « **Reply #38 on:** January 30, 2017, 04:57 PM »

Hi guys sorry I've gone quiet on this I've been working away in America for a couple of weeks.

The frameset is ready now for collection at the painters and I will get over to collect it later this week

As soon as its built and test rode I'm going to write up the build and share it with everyone here so that anyone (who desires to do so) can build one for themselves