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Search: Posts Made By: GrayJay
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05-04-21, 02:15 PM
Replies: 4
Views: 156
Posted By GrayJay

If new races cannot be sourced, Ive had success...

If new races cannot be sourced, Ive had success with swapping races from another donor hub to replace worn races in the hub of a otherwise good wheel. I know I have re-used races from Zeus hubs in...
05-04-21, 02:08 PM
Replies: 28
Views: 556
Posted By GrayJay

Small front wheel time trial funny bikes of the...

Small front wheel time trial funny bikes of the 80's (unlike the terry style subject bike of this thread) were designed around riding position using bullhorn bars mounted as low as possible. Small...
Forum: Framebuilders
05-03-21, 02:16 PM
Replies: 12
Views: 293
Posted By GrayJay

Might be possible to drill out the hinge pin,...

Might be possible to drill out the hinge pin, source a replacement clamp from a worn donor then improvise a new pin?
Forum: Framebuilders
04-30-21, 04:18 PM
Replies: 17
Views: 781
Posted By GrayJay

In one of the old Jack Taylor documentary films,...

In one of the old Jack Taylor documentary films, they explain that the secret for hand-brush pin striping is to first go over to the neighboring pub and get a shot of strong whiskey to steady the...
Forum: Framebuilders
03-16-21, 02:48 PM
Replies: 7
Views: 634
Posted By GrayJay

Water probably entered through a vent hole in the...

Water probably entered through a vent hole in the SS, then bike was hung upside down for extended amount of time and rusted internally. The original chrome plating acids might have also started the...
Forum: Framebuilders
02-12-21, 01:15 PM
Replies: 15
Views: 1,442
Posted By GrayJay

Stack of dimes brazing technique

I recently watched this interesting youtube video on fillet brazing technique for fabrication of a motorcycle frame;
https://www.youtube.com/watch?v=fWF0zCcXR5A&t=422s

His technique was to...
02-07-21, 10:45 PM
Replies: 14,256
Views: 3,160,839
Posted By GrayJay

FYI- Paul Brodie recently dropped a cool in-depth...

FYI- Paul Brodie recently dropped a cool in-depth video where he repaired a set of cracked nukeproof hubs. (apparently the design was nukeproof, not crackproof!) linky: Nuke Proof repair
Forum: Framebuilders
01-28-21, 04:04 PM
Replies: 7
Views: 814
Posted By GrayJay

Another option for more tire clearance, you could...

Another option for more tire clearance, you could remove the fork-end dropouts and replace them with some longer dropouts that would make the fork overall longer and thus provide more vertical...
Forum: Framebuilders
12-31-20, 09:25 PM
Replies: 27
Views: 2,326
Posted By GrayJay

For this braze-on joint, I would probably...

For this braze-on joint, I would probably concentrate more flame heat into the actual shifter boss, less into the tube. The molten braze will "follow the heat" and get pulled underneath the braze-on...
Forum: Framebuilders
12-23-20, 06:19 PM
Replies: 27
Views: 2,326
Posted By GrayJay

Rather than welder tacking, traditional lug...

Rather than welder tacking, traditional lug framebuilding method is to lay on the aligned frame tubes, drill 3 small holes piercing through the lug and tube where they overlap then hammer/tap a small...
Forum: Framebuilders
12-22-20, 01:39 PM
Replies: 10
Views: 887
Posted By GrayJay

Starting from a woodshop, I've built a couple of...

Starting from a woodshop, I've built a couple of frames using a large contractor table saw as a framebuilding platform. The saw has a fairly large ground steel plate surface that I used to get the...
04-15-18, 09:25 PM
Replies: 14,256
Views: 3,160,839
Posted By GrayJay

The manitou I fork looks to be one of the early...

The manitou I fork looks to be one of the early (pre-answer production) that were manufactured by manitou around 1991. It would be good for a early 90's vintage restoration, same fork that Tomac...
Forum: Framebuilders
03-15-18, 02:23 AM
Replies: 5
Views: 1,260
Posted By GrayJay

Learn using the LFB and thicker tubes, save the...

Learn using the LFB and thicker tubes, save the expensive silver rod until you have built a few frames and need it for working on thin-wall tubing.

Refilling small acetylene bottles is fairly...
Forum: Framebuilders
12-12-17, 10:40 PM
Replies: 36
Views: 4,560
Posted By GrayJay

Change in fork length has the effect of changing...

Change in fork length has the effect of changing the head tube angle "HTA" (and also changes the STA and BB height). It takes a fork length change of around 20mm to produce 1 degree of change in the...
Forum: Framebuilders
12-12-17, 10:23 PM
Replies: 36
Views: 4,560
Posted By GrayJay

One of the best descriptions of trail behavior I...

One of the best descriptions of trail behavior I have seen that is well worth reading is at;
Spectrum Cycles | Geometry (http://www.spectrum-cycles.com/geometry.php)

I would image you could do a...
12-03-14, 12:57 AM
Replies: 136
Views: 22,307
Posted By GrayJay

You can get significantly more mechanical...

You can get significantly more mechanical advantage from those MAFACs if you set them up more like a medium profile design (or at least the neo-retro angle as described in the excellent analysis of...
11-27-14, 12:01 PM
Replies: 26
Views: 3,035
Posted By GrayJay

I had and raced on an older used pro-strada in...

I had and raced on an older used pro-strada in the early 1990's, had this identical (red) paint job, chrome and decals. What I mostly remember about it was that the points of the lugs were oddly...
10-26-14, 01:37 AM
Replies: 18
Views: 914
Posted By GrayJay

If the wheel has slipped in the dropouts...

If the wheel has slipped in the dropouts repeatedly, it has likely worn the forward end of the dropout. Once there is a slight taper worn into the dropout faces, it subsequently becomes much easier...
10-19-14, 11:22 AM
Replies: 32
Views: 1,997
Posted By GrayJay

No need to apply heat to re-bend the DO, heat...

No need to apply heat to re-bend the DO, heat will just mess-up the surrounding chrome. Clamping lower half-of the DO in a bench vice would likely work but may leave marks on the outside chrome face...
10-19-14, 10:38 AM
Replies: 57
Views: 7,013
Posted By GrayJay

Not exactly centerpull and no protruding post but...

Not exactly centerpull and no protruding post but in another instance of what it old is new again, the latest trend in breaking for high-end road bikes utilizes dual pivot calipers in which each of...
10-11-14, 10:14 PM
Replies: 34
Views: 3,316
Posted By GrayJay

At that age, OLD spacing would have originally...

At that age, OLD spacing would have originally been 126mm. 3X water bottle bosses sounds MUCH more like a touring frame. Put a rear wheel on it and compare the gap between tire and seattube with...
10-11-14, 09:49 PM
Replies: 48
Views: 7,138
Posted By GrayJay

Neat find, in the USA at least I dont remember...

Neat find, in the USA at least I dont remember ever seeing Giant branded bikes prior to around 1990 when they started marketing their own MTB and Cadex carbon frames. What does the headtube badge...
Forum: Framebuilders
07-24-14, 12:22 PM
Replies: 12
Views: 2,002
Posted By GrayJay

Good thread on kids bike construction, discussion...

Good thread on kids bike construction, discussion of tube sizes and sources;
kids bike 20" (http://forums.mtbr.com/frame-building/kids-bike-20-a-898962.html)
07-11-14, 11:05 AM
Replies: 82
Views: 13,384
Posted By GrayJay

Dont forget 507mm for 24" kid MTB's, 571mm for...

Dont forget 507mm for 24" kid MTB's, 571mm for 650c (26" narrow road tires) both are fairly common. There are also a couple of other 20" wheel sizes that all use different rims. I
nterestingly,...
07-11-14, 10:59 AM
Replies: 82
Views: 13,384
Posted By GrayJay

Fat bikes use standard 559mm (26" mtb tire size)...

Fat bikes use standard 559mm (26" mtb tire size) rims that are really wide (65-100mm width) combined with a huge tire to achieve tire outside diameter that is very close to a 29'er mtb tire. While...
07-08-14, 04:08 PM
Replies: 23
Views: 1,296
Posted By GrayJay

Easy solution, there are these offset brake pad...

Easy solution, there are these offset brake pad holders that add 7mm of reach;
BDop OFFSET HOLDERS (http://www.bdopcycling.com/BDop%20Offset%20Holders.asp)
07-07-14, 12:24 AM
Replies: 18
Views: 1,784
Posted By GrayJay

Rebuilding the wheel with quality new spokes...

Rebuilding the wheel with quality new spokes should be a good fix and work fine so long as the rim is not bent. No compelling reason to replace the hub if it is still in good shape but check first...
06-24-14, 11:05 AM
Replies: 17
Views: 2,805
Posted By GrayJay

Good mathematical analysis of cantilever geometry...

Good mathematical analysis of cantilever geometry at http://www.circleacycles.com/cantilevers/canti-geometry.pdf

Interesting to note that standard narrow angle cantis start with high MA but then...
06-19-14, 10:31 AM
Replies: 16
Views: 1,952
Posted By GrayJay

Looks very similar to the Banesto team bikes that...

Looks very similar to the Banesto team bikes that Indurain rode to TDF wins. Presence of interior helical splines in seattube would indicate if it was SLX or TSX, oria also used splines that run...
06-15-14, 10:02 PM
Replies: 31
Views: 13,048
Posted By GrayJay

If no spacer between the cartridges, I would...

If no spacer between the cartridges, I would adjust them just slightly looser that typical for a loose ball and cone bearing. You will kill the cartridges if there is side preload through the...
06-12-14, 01:05 AM
Replies: 13
Views: 1,546
Posted By GrayJay

If you find that 8s shifters and 7s FW dont play...

If you find that 8s shifters and 7s FW dont play nice together, try one of the alternate RD cable attachment locations in order slightly alter the pull ratio of the RD to increase travel of the RD...
06-07-14, 01:11 AM
Replies: 30
Views: 5,682
Posted By GrayJay

Between the mix of campy/sach/gipiemmi components...

Between the mix of campy/sach/gipiemmi components that are on there now, it is highly likely that someone changed out some of the parts at one time. THe sachs components were somewhat of a budget...
06-06-14, 08:50 PM
Replies: 11
Views: 1,720
Posted By GrayJay

It would probably work better if you disassemble...

It would probably work better if you disassemble the freewheel and use callipers to measure all the existing cogs and spacers, then use sandpaper to lap the spacers thinner where needed in order to...
05-29-14, 07:16 PM
Replies: 9
Views: 1,965
Posted By GrayJay

Ranf should be one of the nicer Oria tubesets, it...

Ranf should be one of the nicer Oria tubesets, it has vertical (not helical like columbus) reinforcing ridges inside the chain stays, down tube, steer tube and seat tube (in which the ridges run...
05-28-14, 11:15 PM
Replies: 9
Views: 1,965
Posted By GrayJay

I would estimate that this blue QA is from around...

I would estimate that this blue QA is from around 1990, give or take a couple of years. Looks like conventional size tubing and classic campy dropouts. Steel QA's from the early/mid 90s were built...
05-20-14, 10:43 AM
Replies: 14
Views: 2,293
Posted By GrayJay

I have a modolo 1" quill stem that dates from...

I have a modolo 1" quill stem that dates from early 90s that used a hinged bar clamp to allow for easy bar mounting. It is not completely removable faceplate design like the more modern & common...
05-16-14, 11:16 AM
Replies: 9
Views: 1,965
Posted By GrayJay

Post some good pictures for an ID of the bike,...

Post some good pictures for an ID of the bike, including any tubing decal. In the 2008 example post above, the decals looks consistent with the QA EL-OS road bike I bought new directly from William...
05-08-14, 12:15 AM
Replies: 13
Views: 989
Posted By GrayJay

You might try using cantilevers fitted with these...

You might try using cantilevers fitted with these offset brake pad holders;
BDop OFFSET HOLDERS (http://www.bdopcycling.com/BDop%20Offset%20Holders.asp)

These are road style pad holders so...
05-07-14, 11:47 PM
Replies: 11
Views: 4,514
Posted By GrayJay

If there is not an external friction shifting...

If there is not an external friction shifting setting, you might be able to just open them up and gut the index mechanism. I seem to remember that suntour index shifters used small ball-bearings and...
05-07-14, 11:43 PM
Replies: 8
Views: 828
Posted By GrayJay

There were long cage Chorus and CDA long cage...

There were long cage Chorus and CDA long cage rear derailleurs made prior to 1992 arrival of ergo shifting that were intended to work with synchroII shifters and had capacity for a 30T rear cog. I...
05-03-14, 12:13 AM
Replies: 50
Views: 7,256
Posted By GrayJay

all is forgiven if you apply reproduction AD...

all is forgiven if you apply reproduction AD decals over the fresh paint!
05-01-14, 10:39 AM
Replies: 15
Views: 1,665
Posted By GrayJay

I would guess that the bike dates from...

I would guess that the bike dates from 1930-1940's. Are the rims wooden or steel?
04-30-14, 03:05 AM
Replies: 19
Views: 1,395
Posted By GrayJay

Looks to me like the crank has self-extractor...

Looks to me like the crank has self-extractor bolts, a feature not found on Athena. More likely these are CDA or Chorus.
04-28-14, 11:15 PM
Replies: 19
Views: 1,395
Posted By GrayJay

I really like the look and font of the downtube...

I really like the look and font of the downtube decal. Paint on this bike is in fantastic shape for its age. Interesting that it still has toeclip pedals, non-aero brake cables and friction shifting....
04-28-14, 10:51 PM
Replies: 19
Views: 1,395
Posted By GrayJay

The RD is an early (84-85) C-record. VeloBase.com...

The RD is an early (84-85) C-record. VeloBase.com - Component: Campagnolo, C-Record First Gen. (http://velobase.com/ViewComponent.aspx?ID=353F4ECB-068F-4A05-A668-EF595DDB39D3&Enum=108&AbsPos=17) ...
04-27-14, 12:20 PM
Replies: 5
Views: 716
Posted By GrayJay

Replacing the cable guide is a very easy brazing...

Replacing the cable guide is a very easy brazing task, very do-able. The bike probably got used as an indoor windtrainer at some point with dripping sweat producing rust. Cable guide replacement...
04-25-14, 10:16 PM
Replies: 9
Views: 1,483
Posted By GrayJay

92mm is a lot of trail for a road bike, that...

92mm is a lot of trail for a road bike, that would require either an unusually slack HTA and/or a fork with very little rake. I really dont think such a bike would have any redeeming handling...
04-23-14, 01:04 PM
Replies: 8
Views: 644
Posted By GrayJay

Use the old cup from the cotter crank to verify...

Use the old cup from the cotter crank to verify that the new BB is same thread pitch. Might just need to have the shells threads chased out to clean them up, might just be full of 60 years worth or...
04-15-14, 03:08 PM
Replies: 16
Views: 1,127
Posted By GrayJay

Since you already have all the parts, it looks to...

Since you already have all the parts, it looks to me that it would be possible to modify the 9-speed cassette splines to fit onto the 8-speed hub body. OD of the spline pattern is same for both, the...
04-09-14, 11:29 AM
Replies: 9
Views: 7,657
Posted By GrayJay

8 speed ergo on a index compatible 7-speed FW...

8 speed ergo on a index compatible 7-speed FW works great, spacing is exactly same 5.0mm as campy 8 speed. You might try a 9-speed chain for even crisper shifting. Campy 8 speed shifters and RD would...
Showing results 1 to 50 of 1000
 


 
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