Adding a longer RD to a Tiagra 10 spd bike to be able to use a much wider range cassette

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Dan Lotus

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Thanks all, appreciate the invaluable knowledge, input, experience and opinions, HUGELY appreciated :-)

Theoretically at 161cm, she is marginally small for it, however as her mum is 173cm, and I'm 178, I don't think she will be growing that much taller, so I'd like to think as an 'occasional' bike, I could probably make it fit with a longer stem etc, as long as she doesn't get incredibly tall.

I'm going to do a bit more mulling, and then make a decision on it soon.
I'm flying out there in Easter half term with her, so it would be a nice surprise if it was waiting when we got there - all be it a job to change the cassette out and RD etc - I have some basic tools out there, but enough for that job.
 
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Dan Lotus

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You can buy a wolfs tooth derailleur hanger extender which will massively extend the range of your cassette.
There are cheaper brands available too eg. Sunrace etc.

I have tried those before, maybe I was unlucky, or inept, but I was unable to get it work efficiently - that was on a 105 5700 setup.
 
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Dan Lotus

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A quick search in the garage tonight has unearthed a new Ultegra 10spd chain, theoretically my partners bike might need it, but I changed it a couple of years ago when I added an 11/34 cassette to her bike, so I don't think that's going to need to be changed anytime soon - she doesn't ride it very much :-(
I also found a short Specialized stem, I recall I bought it 2nd hand ages ago for some project (Might have been when I was trying to finesse my position), but never used it - it's probably 60mm, but has those adjustable shims that allow you to change the angle, not sure how it works, some kind of black magic, but I'm thinking that the chances are it might be a little bit of a stretch for her to start with, so this way I could drop the bars down a bit if required, and bring them closer to her.

So currently, it just looks like I need the RD and a 10spd cassette, the RD I can get from Halfords for £23 after BC discount and work savings card thingy, but they want £39.99 for the 11-34 cassette, so will have to source that elsewhere.
Tredz are favourite currently (£23.99), who are part of the same company as Halfords 😕
 
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Dan Lotus

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Thanks again everyone :-)

I've done the deal with the chap in Spain at 200 Euros (~£172), and my Dad is going to collect it.
I've seen more up close pictures, and it looks pretty much mint, I'd be surprised if it has covered more than 200km.
I've ordered the GS RD from Halfords, that's only set me back £23 after BC discount and work discount.
I've ordered the 11-34 cassette from Tredz, but added a couple of needed items (One for my daughter) to get to just over £55, and then applied ye olde £5 discount - so theoretically the cassette has only cost me £18.99!

I went through TCB for both, so the current total of £41.99 might come down even further (EDIT: £1.50 of cashback has tracked across the two orders, so virtually £40 - very happy with that) - so I'm looking at something just under £214 for it to be fully up and running with suitable gearing - I hope she likes it!!!!!!!!!
I'm relying on the hanger being straight - he says all the gears are working fine, as that's a tool I do not have at my parents place, though if required I could get one from Decathlon probably.
I'll likely take some new bar tape over just in case, as it will make it a bit 'prettier' for her, and an extra bottle cage - side entry, as it's a fairly small frame.

I did look at Decathlon initially, as I recall them selling bikes for around the £200 mark, but was surprised to see they seem to start at £500 now - I guess everything has gone up, and I know from experience the really entry level bikes have not the best quality wheels.

I looked on ebay here, and saw people trying to sell the entry level R1 for more than £200, and an R2, like this, on there for £225, that didn't look in the best condition, so I do feel like this is a decent deal, even though it is around 10 years old.

To my mind, it looks very clean and tidy:
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Also, those pedals, do they look like road pedals but with a removeable flat platform on top?
She's dabbled with clips, but isn't fully committed yet.
I might take a pair of flats over with me.

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Ajax Bay

Guru
Location
East Devon
Looks a really good buy.
Behind the curve, I offer four observations/recommendations.
I doubt the hanger will be bent/non-vertical. You'd see some sign on the RD.
If your daughter reaches her mother's height (173cm) the bike will be too small for her. You don't share the size - I'm just going on the image. I would say max 168cm.
The stem is (my estimate) only 60mm already - no point in taking out another.
I recommend you consider taking out replacement brake blocks if there are downhills to go with the uphills you imply need a 27" gear.
 
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Dan Lotus

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Looks a really good buy.
Behind the curve, I offer four observations/recommendations.
I doubt the hanger will be bent/non-vertical. You'd see some sign on the RD.
If your daughter reaches her mother's height (173cm) the bike will be too small for her. You don't share the size - I'm just going on the image. I would say max 168cm.
The stem is (my estimate) only 60mm already - no point in taking out another.
I recommend you consider taking out replacement brake blocks if there are downhills to go with the uphills you imply need a 27" gear.

There looks to possibly be a small rub on the RD, but maybe just from having been leant against something rather than a fall.
I spotted the current stem length after going to find mine - it is already a tiddler, and 60 was my thought too :-)
The only reason for taking mine over is that it has adjustable angles - but probably not necessary, and something I can always take later in the year.
I dare say you are correct on the size, though I guess I could stretch it out a bit with a longer stem etc, especially as it has a tiddler now, I have some spare 120s knocking about. It already looks to have a ~25mm setback seatpost, so nothing I can do there really, aside a small amount of wiggle room with the saddle rails.
 
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Dan Lotus

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I have possession of the cassette and RD now, just have to see if I can fit them into my tiny carry on luggage :eek:

My Dad sent me a picture of the pedals - any idea what they are, not one I recognise?
1772188286890.png

Is it just a really worn flat pedal, but with a clip on rear reflector than renders them not flat?
I spy a nut, so should be easier to remove than the allen key only ones.
I thought that could be the underside, but when he let the pedal fall naturally and sent the pic, the other side was clearly the underside, as it had a prominent axle.

I've had some simple flat spiky pedals delivered over there, as she is starting to get in to clipped, but that won't be the time to try it I suspect.
 

figbat

Former slippery scientist
I’m a bit late to this topic but I have put a 11-42T cassette on my gravel bike that runs Tiagra (4600). The RD is only specced to 36 (I think) but I have added a drop link (Wolf Tooth are the famous ones, mine is a cheaper copy) which works flawlessly.
 
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Dan Lotus

Veteran
Thanks Figbat, all good stuff :-)
This bike has a pretty friendly 50/34, so I'm fairly confident the 34/34 bottom gear will be sufficient for her - the climbs around my parents place tend to be lengthy as opposed to steep - much more my preference handily :-)
I recall having no success (I spent several hours trying to get the damned thing indexed) with the wolf tooth (Like you I think I went for a copy), when I tried to fit it on my partners Scott CR1 but thinking back, I have a strong feeling she fell off drive side, and bent the derailleur rather than the hanger, as I recall when I then bought a new long cage (105 5700) RD, it worked perfectly - by then I'd also kitted her out with a 34/34 bottom gear, so I didn't revisit the wolf tooth option.

Getting very excited now about her seeing it, as it will be a total surprise, and keep having to stop myself mentioning it in conversation with her or my partner.

These are the pedals I have bought:
1772192523935.png

And bar tape options:

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Need to try and find some valve caps as well.

EDIT: Stole/acquired some purple valve caps off my partners current turbo bike ;-)
 
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Dan Lotus

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Afternoon all,

just thought I would update this thread as we have been out and returned now.

The bike was a total pleasant surprise to her, which was great, and it did look pretty much as good as I thought.
The pedals were odd but happily came off easily, to be replaced (currently by flatties) which are fine until she properly moves across to clips.
One other oddity which I had not appreciated from the pictures, is that all of the cables are going OVER the handlebar, which I'm sure isn't how it came out of the factory - no biggie, but reduces hand positions.

I took all the spares over but as it transpired, and the routes we did, the lower gears were not replied, but they are stashed there, and I am out again in June, so will change it up then.

Tyres were fine, gearing was mostly ok, brakes needed a bit of adjusting, but nothing major - bit of rub in some extreme gears, but I can dial that out when I replace the rear end, chain etc.

My plan in June is to clearly replace the gear cable, and I think at that point I should be able to relocate all of the cables under the handlebar, probably just a case of taking off the faceplate, moving the cables and re-attaching.
The bars also oddly had quite a deep drop, but she didn't complain, and also were rotate back a bit, so I'll sort that as well.

Size wise, it's basically perfect, the seatpost is probably up about 2cm I reckon, and she can ride it comfortably with some bend in her elbows, in all of the hand positions.

I certainly was not going to push it at all with regards to getting her out on the bike, so said nothing, and just started working on the bikes, giving them a clean, as my parents had a ton of dusty building work they all needed a bit of a clean, so I put her to 'work' pumping up all 6 tyres, telling her what psi to put in each tyre.

We reached my parents at about 2pm, so I cracked on pretty much straight away, hoping we might be able to ride something the following day.

Without any prompting she asked on the Friday if we could test the bike for size etc, so we pootled about up and down the road, and down to the beach and just rode a few km, maybe 3 or 4 at most.

Again I said nothing, not wanting to push it, but she asked if we could ride on the Saturday.
I had a route planned around a lake that was maybe 35 minutes drive away, so popped the rack on the car, put the bikes on the back, and we set off after lunch.
It was only ~21k and fairly flat, and I'd specced it so what climbing there was we mostly got out of the way in the first quarter of the ride - this also meant the glorious view as you approach the lake from the north east corner was a lovely surprise late on the loop.
Being a Saturday, and sunny, there was a large volume of bikers (motor) out, and a few cars as well - I think it is a favourite spot for hooning basically, so we had a lot of loud and fast vehicles to deal with, which I thought might cause her bother, but she was fine with it.
*There were no close passes or anything of that sort, just noisy really.
I've seen quite a few flowers attached to various areas on the route, think there have been a number of casualties over the years I expect.

Anyway, that all went well, and again I didn't push anything, but as soon as we got home, she asked if we could go a bit further next time.

I had one bigger route already planned, again round the lake, but with an extension, but probably 3 times the climbing, and I wasn't confident she would make it with the current gearing, and or her stamina - she doesn't like hills currently.
I used Strava (Something I have not done before) on my phone, and found that you could specify a distance range and what kind of elevation you were after, so went for a flatish one, and around 35km - it spat one out of 37km, on some roads I had not ridden before, well some anyway.

We set off on the Monday, and the middle part was REALLY busy roads - again no issues with close passes, and it was ok for me, but I thought she was going to not be that happy about the volume and speed of the traffic, but she said she loved it!
I did of course have to take plenty of snacks and water for her on all these rides - she had a bottle, and I had by bottle and a 2nd one for her on my bike.

After that ride, again we came back, and she asked if we could ride maybe 50km next time :laugh:
Again, I had no route planned for this eventuality, but given the busy roads nature of the previous one, decided to build one myself.
I did use the Strava heatmap feature, and found a great and slightly longer way to avoid a busy road with a long climb, that personally I love as you get a super fast and straight long downhill as a reward, but I knew she wouldn't be a fan.
The outcome was we had to ride mostly quiet roads and cycle paths for 15km, 10km out on this towpath, back again, and then the 15km back again on the roads.
When I say towpath, it was nothing like our canal towpaths here, these are huge perfectly tarmacced wide roads basically, with walkers, cyclists, runners, and the very odd vehicle on them, but they are going slow.
The only negative to this route was the fact it crossed 5 roads (10 in total) which meant we had to stop to cross them each time, a couple in one direction were tricky to see if there was traffic coming or not.

That one took us 3 hours basically, and although she was flagging quite a bit for the last 15k perhaps, we managed to achieve an average of 17kmh, which I think she was pleased with.

Anyway, just wanted to give an update, and say a massive thankyou again for all the advice - the parts, and bar tape are out there, so am hoping she will be similarly enthused when we all go back out there in October, and it's looking even better and has a much better gear range.

Trying to gently keep her momentum up at home, will try and get her onto my spare Rouvy sub as my partner simply does not use it, so that could be a good way to keep her interest - off her own bat she said she would like to ride twice a week which is encouraging, as despite decent quality padded shorts, she still complains of rear end discomfort, but we've all been there, you just need to condition your @rse to it.

Thanks all :-)
 
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